did you do it with your xp cd?
Try the microsoft solution
http://support.microsoft.com/default...b;en-us;324767<<<<<~~~~~~~this one appears to be in better detail
If the problems solved you have done it right if it isnt you haven't
Put xp cd in and in command prompt type :- expand CD-ROM Drive Letter:\i386\autoexec.nt_ c:\windows\system32\autoexec.nt