I aka Sach will diagnose you computer free of cost , If your computer is running slow, most common problem like it has spyware or several programs running from the startup that usually are not needed. Let Sach optimize your machine and make it run as it was FAST as new one. Sach will connect remotely to your computer Via Team Viewer or any remote access software which are free available on internet.
Run multiple virus and malware scans, remove very malware/adware/spyware/rootkits/win32 and cryptographer ransom malware if found. Then clean all your junk/temporary files, Fix errors in your registry Manually, remove startup items which are not needed. Recover Data If Needed . This is 100% effective & safe
I can give you the Full version of tools to prevent from future Virus .. :-)