Well, it’s really hard to say… could also be a hardware problem.
How does it behave in Safe mode - is it also that slow, or does it look OK? I mean, avast! isn’t running in safe mode and neither are many other applications, but you can probably guess by trying to open a few things…
I don’t understand what you try to say it only starts when I scan the system32 files and when the scan freezes at a file can’t use avast in safe mode so can’t try it 
OK, I didn’t understand that - I though it’s slow all the time.
How about a disk check (including surface scan) on the system drive?
Also, when this slowness occurs - is there any process using CPU, according to Task Manager?
- no its not slow all the time only when I scan one of these system32 files.
- a disk check pls explain more I want to try it
- I’m not so sure about it have to kill my system again to check it out
wow thank you Mr.Igor
I did step 2 the disk scan he found this “damaged clusters in file 24330 name \windows\winsxs\AMA022~1.163\DiagCpl.dll replaced.” this was the first file the scan crashed with 
now I can scan my computer again thank you Igor! 