So, i have very big problem! So, i really dont like Vista OS, so i decided to instal over vista XP, i have a cd, and it guess i am doing all right, at first i downloaded all drivers, saved them in flash, then set auto boot cd/dvd drive, then restarted computer...the disc started to load, there was blue monitor, loading something, and then on blue screen showed this error---->>> Check for viruses. Remove any newly installed hard drives or hard drive controllers. Check your hard drive to make sure it is properly configured and terminated. Run CHKDSK/ F to check dard drive corruption, and then restart your computer./// So i scanned all computer for viruses with avast antivirus-all clean, then i deleted all games, newly installed programms etc...in the end i typed run--> chkdsk /f but nothing showed..aah, i checked c and f dicks too, by pressing with left..properties..tools. ....etc.. So in the end some friend (stupid) said that maybe i need to schrink my disc c, but there was some problems too, because i have 107 gb free on disc c, but available schrink volume showed, that i can make another disc only with 2000mb ?? So, im really sorry abaout my english, i know, it is bad, but i hope someone will help me!! Thanks!! ;)

You can't down-grade windows. You can't do it. You have to back-up your data, reboot with the XP-Disk and boot to that CD, then reformat your HD (wiping it clean) and do a clean install. You can also install XP as a dual-boot option, meaning that your computer will pause as it reboots and ask you which OS you want.

i have already saved all data i need in disc, what i need to buckup?? how can i do that? and how can --> reboot with the XP-Disk and boot to that CD??