Restart your computer
After hearing your computer beep once during startup, but before the Windows icon appears, tap the F8 key continually;
Instead of Windows loading as normal, a menu with options should appear;
Select the option to run Safe Mode with Networking, then press "Enter".
Choose your usual account.
Download Hijack This, then Malwarebytes and update MWB.
Restart in normal, run them and post their logs if possible.
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PC Repair Experts