personal anti-virus and MalwareByte's anti-spyware & AVG FE

a personal anti-virus fake Av program found on a client's win-xp home pc. pav.exe, uac*.dll uac*.sys files found on the infected PC. boot from a bootable pc, delete those dlls and the sys. install malwarebyte's AS by renaming it as something else. run malware scan again and again, also update windows. finally the trojan disappeared. in the process, AVG did stop two dll running.