If I were you, I would first boot into safe mode with networking and download and install Malwarebytes, then run a full scan on your C drive. There is also a program called CCleaner that you can use to clean up temp files and fix registry entries, but do so with caution. Make a backup of your registry before you do so. You can also try running scans with Sophos virus removal tool, but again do so with caution. You can run "Msconfig" from the run box to disable services and programs from running and starting with the computer also. But again......lol.....do this with caution as you do not want to disable legitimate programs.
Link to download Malwarebytes:
Link to download CCleaner:
Link to download Sophos Virus Removal Tool:
Information on how to properly use Msconfig:
Let me know if you have any questions