A good antivirus like kaspersky with updates should do it.
The other method(manual)(rather tedious) is put your xp cd goto rescue mode by pressing R and then enter into your os C:\WINDOWS\system32 and delete amvo.exe file by typing
del amvo.exe
then run the following commands
cd\
del autorun.inf
D:
del autorun.inf
repeat this for
ALL the drives
exit
boot windows normally
now in command prompt run attrib -s -h for all the drives .
A file with peculiar name(see the name properly if it is
ntde1ect be careful don't delete the system file
ntdetect from the system drive) appears in all the drives delete that file(a .exe or .cmd file) from all the drives now your system is free from virus.
A tedious one
