Win32:PurityScan-AD [Trj]

Hallo

I have a very big problem with my computer allways when i start it up then always a widow come :

avast ! Warnung ( warning )

malware-name: Win32:PurityScan-AD [Trj]
malware typ: trojan horse

and when i try do delete or the other one then i another window comes:

not able to edit the file …
"kann die datei … nicht bearbeiten "
i dont no what i can do ?? can you help me

sorry but i dont speak english ver well

I suggest you search the boadr for Win32:PurityScan
and you follow the suggestions here: http://forum.avast.com/index.php?topic=24699.msg205956#msg205956

Download and run the PurityScan uninstaller:

http://www.spyany.com/program/article_spw_rm_PurityScan.html