If you think it's a Windows problem, run DISM commands to repair system files. That might be your best chance. Otherwise in the absence of a full system back up prior to installtion (do you have backup software or Windows Restore on?), you're looking at a clean installation of Windows & days reinstalling / configuring everything. My advice, start small. Run Chkdsk. If no joy, run DISM and DISM cleanup command. If No Joy look for a Restore Point. If no joy use a software backup point if you are using backup software. If no joy consider your position vis a vis a Windows Installation and the options. Again start small - re-install Windows with files intact option. Then escalate from there if unsusccessful. Going Nuclear in round 1, will simply cause you pain.