malware in restore point? false/positive of avast or ?

Help me, i dont’ know, latest week AVAST find in the restore point of windows xp
an WIN32:Malorb-v crypt malware, I delete all the restore points and re-install its !

Teo days ago I repeat the scan and avast find none , all clean! Yesterday I repeat the
Scan and AVAST find a new malware infection in a restore point !

NOW, is possible this or a FALSE/POSITIVE of avast ? Is possible that I have in
My computer a malware that create this infection in the restore point , and this
Malware is not find when avast scan my pc ?

I scan with MBAM (antimalwarebyte’s) but it find none, all ok !

False/positive by avast or avast NOT find the malware in my computer ???

I send this malware in the basket trash …but in avast 6 where is the trash ? I not
Find this folder in avast program!

Here my comments…
http://forum.avast.com/index.php?topic=85179.0

ciaooo giorgio ma dove si trova il cestino in avast 6 ? aiutooo