hi, i just installed avast and it detected that i had a virus. I hit remove virus and it starts a memory scan and then my mouse freezes and nothing happens. Is this normal or should i reinstall.
not normal. boot in safe mode and scan to clean the virus
Do you remember which virus was that? Which file was infected?
You can try either to schedule a boot time scanning (before Windows starts). 
In adition to the questions above: what is your OS?
You pushed the ‘Completely remove the virus from my system’ button?
What was the name of the virus?
Thanks
Vlk