I was using my (Windows XP) computer which has 2.49 GB free space, and the only thing I was doing was browsing the web. A few minutes later, I got a notification that I was running out of space, which when I check was about 89 MB.Is there any way to easily find the most recently written/modified files so I can know where all that space went to?
Just use Windows search for files newer than a specific date, or between certain dates.
You should first right-click on your C: drive in Windows explorer and perform disk cleanup, though. Likely you have GB of files in your Recycle Bin and other places. You can also use your browser to clear its cache.