Thanks! I believe that Avast got updated after the PC came out of sleep mode. It then went back into sleep mode due to inactivity on the PC. Since then it has not been able to boot up.

I have run the FRST64.exe as stated and clicked fix however on normal boot, it still went to blue screen and on safe mode boot, it still is stuck at aswrvrt.sys.

I have attached fixlog.txt for your benefit.

Many thanks