system
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Can You Run Into Safe Mode? Try By Pressing F8 And Keep Pressing It Until You Get A Menu Saying:
Start Windows Normally
Run In Safe Mode
Run In Safe Mode With Networking
Etc… (Not In Order)
Click Run In Safe Mode With Networking. If Your Computer Gets Shut Down With Networking Try Running In Safe Mode Without Networking. If It Does Work With Networking Update Your Avast.
Schedule A Boot-Time Scan Now. See If It Finds Anything.
Good Luck! 