When trying to install ESET NOD32 Antivirus, I get the error message: Service 'ESET' service' (ekrn) failed to start. Verify that you have sufficient privileges to start system services. First I had the trial version of a previous ESET, which wouldn't let me upgrade to the full version--every time I clicked on upgrading, it told me it failed to upgrade--and I read that you can't upgrade from the trial, you have to install the full version and put in your information then, so I uninstalled the trial version and downloaded the full, but the full is what isn't installing. I wonder if this problem has something to do with the previous version not being fully uninstalled prior, though it seemed it was, and the computer was restarted since then. Anyway, any advice?