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C:\Windows\Installer and C:\Windows\winsxs Folders Huge!

Last Modified: 2012-08-01

I'm on Windows 7

I have these two folders under my C:\ ,  "C:\windows\installer" and "C:\windows\winsxs".   Right now they are taking up 20 gigs and my harddrive is running out of space.  I have less than a gig left of disk space.  

How can I safely clean these folders up?

Any help appreciated.

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