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My C: is getting full regularly and now I don't have space. (It is less than 500Mb and system freezes or crashes often). I have already moved all user documents to other harddrive. I want to move APPDATA (which is around 1.5GB) files to D drive. How to go about it. I copied all of appdata (both local and roaming) to the other hard drive. I need to change %USERPROFILE% from c:\Users\{username} to D:\Users\{username}.

I guess then I am done. How to do it? I couldn't find userprofile in the environment variables.

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with that little space, i would consider moving the pagefile as well and make it static. – Lorenzo Von Matterhorn Sep 28 '13 at 8:50

Move your pictures and files to a second partition and use the Library feature of Windows 7:

Also use TreeSizeFree so see which other folders are very large and check those folders if you need them on C:

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