Malwarebytes not executing

[pwrwoman]

I hope someone can help me. I've got some nasty something and I have tried everything, including the directions in this thread: http://www.malwarebytes.org/forums/index.php?showtopic=7668

The problem: I *think* I have a browser hijacker. I have been using Firefox (I've since uninstalled this), and when going to antivirus/spyware/malware websites, I get a page load error with another tab popping up with Google as the home page. Through IE, I have been able to download Spybot S&D and Malwarebytes, but cannot run either one. I've tried downloading hijackthis with no luck. I didn't have the TDSSserv.sys driver to disable, but I did try installing Malwarebytes with another name on the executable.

I can still run the antivirus/spyware programs that had been installed previously: Ad-aware and McAfee (through aol). Everytime I run either one of them, I get something. My husband in trying to help, downloaded and ran stopzilla (not purchased and since uninstalled) and pctools spyware doctor (purchased, but he claims he has no registration key, and since uninstalled). I'm convinced those caused more problems than they solved.

Please be gentle - I'm clearly not an IT professional, just a girl trying to get her computer "normal" again. Bottom line, I need help figuring out what on earth this is that I have, and the remedy to run something to clean it.

Thank you!

[SpySentinel]

Welcome to Malwarebytes'

Please read and follow the instructions provided here: Pre- HJT Post Instructions

When ready please post your logs here: Malware Removal - HijackThis Logs

So we can help get you cleaned up.

During this scan and cleanup process you should not install any other software unless requested to do so.