A month ago I installed ESET Smart Security with a trial version for a month. After this month has ended, I uninstalled it (with its own uninstaller) and installed instead AVG Internet Security. Everything was working fine until the installation of ESET, since then I cannot open my Task Manager. It appears for a second, then disappears. Sometimes it doesn't even appear.
Today I tried to install CCleaner Professional (Trial version), the installation went smooth, but again, when starting it, it disappears in a second. I suppose these mysterious disappearances have to do with the initial ESET. Also, when trying to manually clean my registry (Run-> regedit), nothing appears. I use Windows 7. How could this be solved?
