I would suggest doing a manual uninstall of ESET (using the steps below) then try to reinstall and see if that fixes it.
hxxp://kb.eset.com/esetkb/index?page=content&id=SOLN2289
If the script was already ran on your computer you can enable AntiTheft and should not have an issue. I think the script actually fixes the issue that the Dell image had that cause the problem in the first place.