Please have a look at the following KB Articles see if this helps
http://support.microsoft.com/kb/q294728/
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Sandeep KT
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A Stop in Win32k.sys usually indicates a problem with one of two things.
This is not a rule, but a good place to start.
The first thing to look at would be printer drivers. The second thing would
be some sort of 3rd party remote control software.

Signature
Chris
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Please reply to the newsgroup to that others may benefit.
> On one of PCs in network I have occasionally blue screen with
> "KMODE_EXCEPTION_NOT_HANDLED address a001f651 has base at a0000000 -
> win32k.sys". Do anybody some idea? Thanks.