Have you used any Registry Cleaners (Advanced System Care, Registry Mechanic, ect.) before? Maybe Malware could be hogging up system resources, causing your system to hang.
If you used a "Registry Cleaner" program, roll-back the changes if possible (I know Advanced System Care can roll-back changes). And If you didn't use a "Registry Cleaner" program, download, install, and run a scan with "Malwarebytes Anti-Malware" and see if something comes up.