Scan stops at 3% and wont run in safemode

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Hi i have avast on 2 computers have been using it since 2014 and buy the updates. recently i got the trial version for my partners pc as i had to do a reinstall of windows 8 for him. When i left the scan run last night i came down in the morning and it was on 3%. i stopped it but it froze his computer so i tried running it again in safe mode and it said no endpoint available or something along that lines. so again i tried to run it on normal mode and low and behold its stopped now on 3% for the last 2 hours.

I dont have spybot running or malewarebytes the only thing on the desktop is Avast and printer.
Any help on this would be great

Thanks

[Eddy]

Check the log file and see where (at what point) it stops.

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Check the log file and see where (at what point) it stops.

Hi Eddy it stops on different files but seems to be the fonts folder this time

[Eddy]

Did you install all updates for Windows ?
What exact version of avast ?

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Its avast Premier
and yes all updates installed as far as i know. it did an update and is now asking me to go to windows 10

just a note when i try to stop it it freezes everything even Task manager wont open

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Have updated to windows 10 just to see what would happen and it now stops on 9%

[Eddy]

Since you upgraded to Windows 10, perform a clean installation of the latest avast version.