I keep on getting an alert for this virus. Does anyone know how to get rid of it or is it a false one
Say in which file and folder Avast reports that file and i assume that you should update your Windows and IE. That Downloader tries to download and install some Adware Stuff.
You could post a Hijackthis log here if you want: http://www.merijn.org/files/HijackThis.exe
(start it, press scan, save log and paste/copy the content of the up poping Editor here)
spybot search and destroy detects that trojan 
This is what it states
C:\System Volume Information_restore{11576C2E-9E2F-4DB6-ABFA-1A5CFEDB4BF7}\RP82\A0009297.exe