Hey fishbird. Not discounting anyone's suggestions here, but this is what I would do as I've seen this type of situation many times over. You can do wonders if your system came with an XP disk,or if your system has a Recovery partition that can restore your system back to the state it was when new. If the OS was never reinstalled, and as you say, the disk drive is almost filled up, I would save any important documents,files,pics,etc to an external drive or a big enough flashdrive for your data, and reinstall the OS to get rid of all the junk , especially on any system older than 4 years as the junk will pile up, especially on a system that doesn't receive regular maintenance. After all is done and a good, updated Anti-Virus is installed, do a full scan on any data saved before you put it back on your system.