Ok so i just recently installed 2 more 1 gb sticks of ram to my pre existing 2gb ram memory originally equipped on my computer. as well as a new power supply. booted up the operating system multiple times with no issues.......still running windows xp. then suddenly i just restarted my computer and it gives me a unable to find local user dialogue box prior to starting windows. and once it loads up everything on my computer has been erased including my background back to the stock windows xp image. the computer even asks me if i would like to take a tour of windows xp. what the hell went wrong and what do i have to do to fix it??