If you have to get into control panel in ME in order to disable System Restore then you have a problem?
If not disable system restore, reboot, that should have cleared the files from the restore files and check again with avast to confirm.
Need to get into control panel, system, do an explorer search for sysdm.cpl (or *.cpl)and see what it brings up, double click on the sysdm.cpl file and this should bring up your system properties where you can get the System Restore Tab.
HTH David