There may be plenty of space to be had. Since you want to do a repair installation, I'd also use the option to remove all but the last system restore point. There are areas that the cleanup utility doesn't touch that you can do manually. For instance, it only cleans temp files and IE cache for the current user. You either log on as all the different users and do cleanup for each one or do this manually. You can also clean up IE under internet options. There is a setting to automatically delete the cache when exiting the browser and I set mine to do that. You'd be amazed at how much you can clean up using this simple method.
win 7 64
Needed a repair install so I downloaded it here http://www.sevenforums.com/tutorials/3413-repair-install.html and I tried to install it twice and both times after about an hour it stopped telling me that there wasn't enough room to do the repair (one time the room was over 100g and the the other it was nearly 300g)
It surely doesn't need more room does it?
Thanks for any help