i'm trying to help my friend with her computer running Windows 7 64 bit Professional with SP1. Size of C: partition on her HDD is 36 GB. Free space left is less than 1 GB. Most of space is taken by winsxs - about 8 GB. She run cleanup of winsxs and gained some free space, but later electricity in her house got shut off, and then free space disappeared again, she doesn't know why. She also used tools like CCleaner and scanned her computer using antivirus software (Avira) and some online scanners. No infections were found. What else can she do?
36 GB for C: ?
Even if you go to the trouble to install every single program on another drive, C: will still run full with just the stuff that Windows needs to store (for technical reasons) in C:.
Even if you use a C: drive with ample space, if the Windows installation lives long enough eventually it will fill up.
Please... Resize the volumes and make C: at least 50 GB.
This 50 GB is a rule of thumb value that for most people will mean they can operate Win7 for 3-4 years without C: running full.
Win SxS might not be taking 8GB of space, it just appears that way because Explorer can't report what it does properly (hard links link to the same small amount of data over and over, but Explorer reports the size as if it was multiple copies). See http://blogs.msdn.com/b/e7/archive/2008/11/19/disk-space.aspx for the details.
Run a program like TreePie (run as administrator) to show sizes of folders on the disk and look for other large folders.
Also check System Restore, previous versions, and recycle bins.
2.Windows has a lot of temp folders and such. The windows swap file could have easily consumed the remaining space.
In addition to winsxs windows has a bunch other places to delete built up files from.
In addition run the windows disk clean up tool in administrative mode and check the "Windows update" option. After the clean tools completes, reboot and some of the space will be released.
3.While thinking about how many hours of pain you will have to go through to get windows stable with 36gb space, go here: http://www.newegg.com/Product/Product.aspx?Item=N82E16820148693 This will save you lots of time.