UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 12b-25
Commission File Number 811-6540
CUSIP Number 09254E 10 3
NOTIFICATION OF LATE FILING
(Check One):
[_] Form 10-K [_] Form 20-F
[_] Form 11-K [_] Form 10-Q
[X] Form N-SAR [_] Form N-CSR
For Period Ended: October 31, 2006_________________________
[_] Transition Report on Form 10-K
[_] Transition Report on Form 20-F
[_] Transition Report on Form 11-K
[_] Transition Report on Form 10-Q
[_] Transition Report on Form N-SAR
[_] Transition Report on Form N-CSR
For the Transition Period Ended:____________________________
Read Attached Instruction Sheet Before Preparing Form. Please Print
or Type.
Nothing in this form shall be construed to imply that the Commission
has verified any information contained herein.
If the notification relates to a portion of the filing checked above,
identify the Item(s) to which the notification
relates:________________________
PART I
REGISTRANT INFORMATION
BlackRock MuniYield Insured Fund, Inc.
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Full Name of Registrant
MuniYield Insured Fund, Inc.
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Former Name if Applicable
800 Scudders Mill Road
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Address of Principal Executive Office (Street and Number)
Plainsboro, New Jersey 08536
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City, State and Zip Code
PART II
RULE 12b-25(b) AND (c)
If the subject report could not be filed without unreasonable effort
or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check box if appropriate) X
(a) The reasons described in reasonable detail in Part III of this
form could not be eliminated without unreasonable effort or expense;
(b) The subject annual report, semi-annual report, transition report
on Form 10-K, Form 20-F, 11-K, Form N-SAR or Form N-CSR, or portion thereof
will be filed on or before the 15th calendar day following the prescribed due
date; or the subject quarterly report or transition report on Form 10-Q, or
portion thereof will be filed on or before the fifth calendar day following
the prescribed due date; and
(c) The accountant's statement or other exhibit required by Rule
12b-25(c) has been attached if applicable.
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PART III
NARRATIVE
State below in reasonable detail the reasons why Forms 10-K, 20-F,
11-K, 10-Q, N-SAR, N-CSR or the transition report or portion thereof could not
be filed within the prescribed time period. (Attach extra sheets if needed.)
Due to a recent change in the accounting interpretation of the
presentation in the Fund's financial statements of investments in tender
option bonds or inverse floating rate bonds, the Fund is not able to finalize
the presentation of these investments in its financial statements for a timely
filing of its Form N-SAR to be made. Additionally, as a result of the
foregoing, Deloitte & Touche LLP, the Fund's independent registered public
accounting firm, is not able to finalize their audit of the financial
statements of the Fund for a timely filing of the Form N-SAR to be made. The
Fund's Form N-SAR will be completed and filed with the Securities and Exchange
Commission as soon as practicable.
PART IV
OTHER INFORMATION
(1) Name and telephone number of person to contact in regard to this
notification.
Donald C. Burke (609) 282-7085
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(Name) (Area code) (Telephone number)
(2) Have all other periodic reports required under Section 13 or
15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment
Company Act of 1940 during the preceding 12 months or for such shorter period
that the registrant was required to file such report(s) been filed? If answer
is no, identify report(s).
_X_ Yes ___ No
(3) Is it anticipated that any significant change in results of
operations from the corresponding period for the last fiscal year will be
reflected by the earnings statements to be included in the subject report or
portion thereof?
___ Yes _X_ No
If so, attach an explanation of the anticipated change, both
narratively and quantitatively, and, if appropriate, state the reasons why a
reasonable estimate of the results cannot be made.
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Date December 22, 2006 By /s/ Donald C. Burke
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Donald C. Burke
Vice President and Treasurer
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