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Whenever Windows updates, it sometimes/most times downloads installation files, and then uses those files to install the update onto the OS (correct me if I'm wrong on this assumption). What I want to know is if those files aren't crucial to the operation of the OS and can be deleted. If so, then where can I locate those files and delete them?

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Look at this page for some info on system cleaning on updates. It doesn't talk about all updates but it could help you out. – David Remy Sep 3 '10 at 16:44
up vote 6 down vote accepted

It's safe to delete the SoftwareDistribution folder which keeps the stuff you describe.

Read this Microsoft KB article which describes how...

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there is no method 10 on that link – IsmailS Oct 11 '12 at 7:17
@iSid: Has been reviewed in late August, thanks. – Tom Wijsman Oct 11 '12 at 12:46

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