Is your PC running inefficiently? You could have malware and viruses. Malware threats are known to take out many parts of the operating system. For example, recently a malware corrupted the Windows Update Database in a Windows 10 system along with the network service registry. These threats can sneak into your systems, without a trace. Until they corrupt and take over your PC. Make sure and have an active subscription to anti-virus software running 24/7. If you think you could have a virus or malware, run a scan through your anti-virus software or download and run Malwarebytes.