ok have major problem with my desktop for some strange reason while i was using my pc strange errors started to happen so just thinking that it need a reboot i rebooted the system as it rebooted but stopped and rebooted windows then told me that it failed to load so i choose normal it did a scan and a found a problem and removed the file this is were my problem started
i had to reboot and then told me a file with in the system folder was missing and i need to repair it i tryed this but it to found errors so refused to load so i tryed to do a repair this failed so deleted partiton and formated now i'm getting this error STOP: c0000221 UNKNOWN ERROR \SYSTEMROOT\SYSTEM32\NTDLL.DLL
NEED URGENT ADVICE ON THIS COULD IT BE A VIRUS DID HAVE NORTON AV INSTALLED
If you did a full reformat then it is unlikely to be a virus.
Can you boot into safe mode? Getting that far probably means that Windows is all OK, but a program you've put on after loading windows is at fault.
Have you been using the XP CD to reformat etc? You could try formatting with a modified boot disk that will work for XP from click here. You'll have to FDisk, to delete and create a new partition, then Format to FAT32. Then put the XP CD in and it should run setup from there.