[H] TrojanDownloader:Win32.Mesmer.A

[Winterlight]

Somewhere in the last 24 hours I picked up the rootkit virus 
TrojanDownloader:Win32.Mesmer.A . Just about every time I try to use 
a link I get redirected somewhere else. I am running Security 
Essentials and a scan did find and eliminate it but of course when I 
rebooted it was back. I know rootkit viruses are difficult or 
impossible to get rid of.

 If I restore a clean Acronis image file of my OS partition, from 
last month would that do it? Or should I spend the time trying to 
kill it and if so what is the best way.. anybody have experience with this?

Thanks.