I really need help removing this Gedza.A virus it has replaced many of my diles with scripts. PLEASE!! HELP!

http://uk.trendmicro-europe.com/enterprise/vinfo/encyclopedia.php?LYstr=VMAINDATA&vNav=2&VName=VBS_GEDZA.A


http://securityresponse.symantec.com/avcenter/venc/data/vbs.gaggle.e@mm.html

Too late I reformatted my Media Center computer.
By the time I did that it had literally replaced all my files with wondows scripts.