I'm getting a 404 error on your Sysnative link in that it could have been moved or deleted so I can't see what has already been done.
Windows Repair can only repair infection damage after an infection has been removed.
2 hours is too long unless you have had an infection - are you running the program in Safe Mode with Networking ?
Have you done an antimalware scan ?
If you haven't then download the free version of MBAM and click on Scan in the left pane and select Custom Scan/Configure Scan.
Check at least the box for C: and see if that finds anything - including the Rootkit option is optional and will extend the scan time.
https://www.malwarebytes.com/mwb-download/