Help! Problem afeter uninstalling Eset Smart Security

I installed smart Security trial for some time, but didn't like it, so now I unistalled it, but I can't install any other antivirus or program. Some setups simply show this error: "Error writing to file: C:\xxxx\xxx\xxx\xxx.exe. Verfify thta you have acces to that directory", no matter in which directory i try to install it. Some others like avast dont even show a messege but when I check de the acces to avast it has no icon and cannot find the executable, so i got into the avast folder an most o the executables where missing, i mean they where and disappeared... and this happens with every program, now my system erases most of the executables. It seems as some component of Eset is still in my computer, but the old folder where i installed smar security is not there. I tried everything said on the 106 problem, erased temp folders, etc, but it didnt work.
Please help!
thanks