Answer to: Floors on passenger side wetThe wet floors sound like a leak letting in rain or snow. The defogging issue is a bit more complex, but I would check the fuse boxes first and make sure the fuse for the defroster isn't blown.
Answer to: Why is my disc player won't open?MS has a tutorial for getting the tray open manually: http://support.xbox.com/en-US/xbox-360/console/manually-eject-disc
Answer to: How do I remove any unused programs and files on my Hard Drive?XP should have a utility called disk cleanup that will remove junk files like .tmp files. Other than that, you would have to go through the program list and uninstall things or delete files you don't need.