PAGE  1
000 B000000 10/31/2007
000 C000000 0000883412
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLACKROCK MUNIYIELD INSURED FUND, INC.
001 B000000 811-06540
001 C000000 8004417762
002 A000000 P.O. BOX 9011
002 B000000 PRINCETON
002 C000000 NJ
002 D010000 08543
002 D020000 9011
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
007 C010200  2
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
007 C011100 11
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
008 A000002 BLACKROCK INVESTMENT MANAGEMENT, LLC
008 B000002 S
      PAGE  2
008 C000002 801-56972
008 D010002 PLAINSBORO
008 D020002 NJ
008 D030002 08536
011 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
011 B000001 8-7221
011 C010001 NEW YORK
011 C020001 NY
011 C030001 10281
011 C040001 1201
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A. (COMMOM)
012 B000001 85-11340
012 C010001 PROVIDENCE
012 C020001 RI
012 C030001 02940
012 C040001 3010
012 A000002 THE BANK OF NEW YORK MELLON (PREFERRED)
012 B000002 85-05006
012 C010002 NEW YORK
012 C020002 NY
012 C030002 10286
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 PRINCETON
013 B020001 NJ
013 B030001 08540
014 A000001 MLPF&S AND OTHER ML BROKER/DEALER AFFILIATES
014 B000001 8-7221
014 A000002 BLACKROCK INVESTMENTS, INC.
014 B000002 8-048436
014 A000003 NORTHERN FUNDS DISTRIBUTORS, LLC
014 B000003 8-051242
014 A000004 PNC CAPITAL MARKETS, LLC
014 B000004 8-032493
014 A000005 J.J.B. HILLIARD W.L. LYONS, INC.
014 B000005 8-033133
014 A000006 PFPC DISTRIBUTORS, INC.
014 B000006 8-045467
014 A000007 MGI FUNDS DISTRIBUTORS, INC.
014 B000007 8-046960
014 A000008 ABN AMRO DISTRIBUTION SERVICES, INC.
014 B000008 8-052396
014 A000009 BLACKROCK DISTRIBUTORS, INC.
014 B000009 8-048775
014 A000010 PERSIMMON SECURITIES, INC.
014 B000010 8-053071
014 A000011 PNC INVESTMENTS LLC
014 B000011 8-066195
014 A000012 STATE STREET RESEARCH INVEST SERV, INC.
014 B000012 8-035442
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
      PAGE  3
015 C010001 BOSTON
015 C020001 MA
015 C030001 02101
015 E010001 X
015 A000002 THE BANK OF NEW YORK MELLON
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10286
015 E010002 X
015 A000003 BANKERS TRUST COMPANY
015 B000003 S
015 C010003 NEW YORK
015 C020003 NY
015 C030003 10006
015 E010003 X
015 A000004 J.P. MORGAN CHASE BANK
015 B000004 S
015 C010004 NEW YORK
015 C020004 NY
015 C030004 10017
015 E010004 X
015 A000005 CUSTODIAL TRUST CO.
015 B000005 S
015 C010005 NEW YORK
015 C020005 NY
015 C030005 10167
015 E010005 X
015 A000006 MORGAN GUARANTY TRUST CO. OF NEW YORK
015 B000006 S
015 C010006 NEW YORK
015 C020006 NY
015 C030006 10260
015 E010006 X
018  000000 Y
019 A000000 Y
019 B000000  169
019 C000000 BLACKROCKC
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 GOLDMAN, SACHS & CO.
022 B000001 13-5108880
      PAGE  4
022 C000001    799758
022 D000001    675928
022 A000002 MERRILL LYNCH INSTITUTIONAL TAX-EXEMPT FUND
022 B000002 22-2509978
022 C000002    481100
022 D000002    476200
022 A000003 J.P. MORGAN SECURITIES INC.
022 B000003 13-3224016
022 C000003    349947
022 D000003    389187
022 A000004 CITIGROUP GLOBAL MARKETS, INC.
022 B000004 11-2418191
022 C000004    359382
022 D000004    308230
022 A000005 MORGAN STANLEY & CO. INCORPORATED
022 B000005 13-2655998
022 C000005    261703
022 D000005    324256
022 A000006 UBS SECURITIES LLC
022 B000006 13-3873456
022 C000006    244139
022 D000006    193838
022 A000007 LEHMAN BROTHERS INC.
022 B000007 13-2518466
022 C000007    227459
022 D000007    179679
022 A000008 MORGAN KEEGAN & COMPANY, INC.
022 B000008 64-0474907
022 C000008    183942
022 D000008    178949
022 A000009 BEAR, STEARNS & CO. INC.
022 B000009 13-3299429
022 C000009    139643
022 D000009    136546
022 A000010 BANC OF AMERICA SECURITIES LLC
022 B000010 56-2058405
022 C000010     78890
022 D000010    144725
023 C000000    3514552
023 D000000    3483110
024  000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
      PAGE  5
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.500
048 A010000        0
048 A020000 0.000
048 B010000        0
048 B020000 0.000
048 C010000        0
048 C020000 0.000
048 D010000        0
048 D020000 0.000
048 E010000        0
048 E020000 0.000
048 F010000        0
048 F020000 0.000
048 G010000        0
048 G020000 0.000
048 H010000        0
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
048 J020000 0.000
048 K010000        0
048 K020000 0.000
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
055 A000000 N
055 B000000 N
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
      PAGE  6
060 A000000 N
060 B000000 N
061  000000        0
062 A000000 Y
062 B000000   0.0
062 C000000   0.0
062 D000000   0.0
062 E000000   4.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
062 J000000   0.0
062 K000000   0.0
062 L000000   0.0
062 M000000   0.0
062 N000000   0.0
062 O000000 172.4
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.5
063 A000000   0
063 B000000 24.8
064 A000000 Y
064 B000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 N
070 J020000 N
070 K010000 Y
      PAGE  7
070 K020000 Y
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000   2056030
071 B000000   2075137
071 C000000   1755965
071 D000000  117
072 A000000 12
072 B000000    86746
072 C000000      222
072 D000000        0
072 E000000        0
072 F000000     7897
072 G000000      357
072 H000000        0
072 I000000      152
072 J000000       79
072 K000000        0
072 L000000       80
072 M000000       52
072 N000000        0
072 O000000        0
072 P000000     6876
072 Q000000        0
072 R000000       72
072 S000000       49
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000     1625
072 X000000    17239
072 Y000000       12
072 Z000000    69741
072AA000000    35147
072BB000000    39029
072CC010000        0
072CC020000    48972
072DD010000    45362
072DD020000        0
      PAGE  8
072EE000000        0
073 A010000   0.6740
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000       98
074 B000000        0
074 C000000    39270
074 D000000  1690364
074 E000000        0
074 F000000        0
074 G000000        0
074 H000000        0
074 I000000     4902
074 J000000    31582
074 K000000        0
074 L000000    24345
074 M000000      647
074 N000000  1791208
074 O000000    54194
074 P000000      671
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000   185062
074 S000000   570540
074 T000000   980741
074 U010000    67303
074 U020000        0
074 V010000    14.57
074 V020000     0.00
074 W000000   0.0000
074 X000000    22787
074 Y000000    55140
075 A000000        0
075 B000000  1579343
076  000000    13.04
077 A000000 Y
077 B000000 Y
077 K000000 Y
077 O000000 Y
077 Q010000 Y
078  000000 N
080 A000000 ICI MUTUAL INSURANCE CO.
080 C000000     1500
081 A000000 Y
081 B000000 125
082 A000000 N
082 B000000        0
083 A000000 N
      PAGE  9
083 B000000        0
084 A000000 N
084 B000000        0
085 A000000 Y
085 B000000 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON STOCK
087 A020000 09254E103
087 A030000 MYI
087 B010000 PREFERRED STOCK
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE   DONALD C. BURKE
TITLE       TREASURER