Angel

Hey i bought eset awhile ago. and a few months later (today) it was gone from my pc. Now when i try to install it, It says the computer has not been restarted after a program uninstallation. Please restart the computer and run the installer again. Well i restarted my computer 3 times and it still says the same thing. I dont think i uninstalled any programs recently ether. What should i do? i ran the cleaner it tells me to install at the end.