Unable to completely remove HackTool.Rootkit virus
 

my pc is affected by Hacktool.Rootkit virus.
intially my remon.sys file from system32 folder was affected with Hacktool.Rootkit virus.
after long time it is fine but now a new file is affected called spoolv.sys from sytem32 itself with the same,Hacktool.Rootkit virus.

i m using windows XP

i m using NAV2005

can u plz help me out
where can i get an anti virus for this virus "Hacktool.Rootkit
virus"