Ok, so it appears that it was likely to be the progress that wasn’t doing anything, however the back-end of avast was clearly scanning away. So i managed to scan my computer overnight successfully with no malware on my file system. Its hard to give a time estimate for how long it took to scan all 800GB of files as i wasn’t keep a close eye on things, i’d guess around 6 hours.

Anyways thanks guys for your help :smiley: