:-| I've seen installations with several hundred MB in them. Do you use Windows Update from the web? I don't use compression on folders and files. Doesn't Windows treat a compressed folder internally as a single file (or something like that)
The Windows Update SoftwareDistribution directory (C:\WINDOWS\SoftwareDistribution\) can easily eat up a few hundred megabytes of space due to all the downloaded updates (in the download dir). Windows does not delete these, and it would be cool if ccleaner would be able to clean this. Especially since we are talking about so much space here....