Windows freeze up

My Windows freeze up many times a day. Every time Ive the same error, last one was:

Date: 2009-04-05
Hour: 22:08:04
Event Id: 7000
Category: none
Filename: netevent.dll
File Version: 5.1.2600.0
Product name: Microsoft Windows Operating...
Product version: 5.1.2600.0
Source: Service control manager

What should I Do??? Please help me!

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