Please download and run the following tool to help allow other programs to run. (courtesy of Grinler at BleepingComputer.com)
There are 4 different versions. If one of them won't run then download and try to run the other one.
Vista and Win7 users need to right click and choose Run as Admin
You only need to get one of them to run, not all of them.
The tool should run on all 32bit versions of current Windows (XP, Vista, Windows 7).
After you ran the tool, try AVG again.
I have tried many times to turn on my AVG anti virus, but it won't turn on. I also tried free online scans. My computer will not download, save, or run any kind of anti-virus or malware/adware removal tools or scans to find the problems. I also tried to download and run HijackThis, but that won't work either. My OS is Vista if that makes any difference.