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                   </-VERIFYING SIGNATURE OF SYSTEM FILES-/>

Microsoft has all system files digitally signed, sometimes 3rd party
applications can overwrite these important files with either invalid or
outdated versions. To make sure all system files are current and digitally
signed do this:
- click start, run..
- type sigverif in the box, and click ok
- click start

NOTE: You need to have some knowledge of your hardware's drivers to do 
this, some files are simply not digitally signed but are stable.