I've just had my residient shield on AVG pop up and tell me my PC has got a virus, located in:

C:\System Volume Information\_restore{A0972726-0074-43BE-8D6D-3D71780987D9}\RP85\A0067328.exe

Just ran my anti virus and it won't pick it up

So I'm trying to access the folder manually and scan just the one file but every time I try it tells me access is denied...

Any ideas?