My computer has been running slow the past weeks, so I scanned it for spyware and also installed Advanced System Care. It found some malware and I also cleaned the registry with it. However the uninstaller which comes with ASC seems to have done a mess. It blocked during uninstall of some programs and now I can't install certain new programs, as it says Windows Uninstaller is corrupted. Also it installed 6/12 windows updates, the rest give errors. The restore points are not working, I get an error like "80070002" the system couldn't be restored.
I scanned the computer with Avira, MalwareBytes, Superantispyware and it looks clean.
Please help, how can I fix Windows Installer?