Total Security took over system

Hi! My computer is Windows XP....using AVG as virus protection and AD-Aware and occassionally Spybot for junk removal. Last week a program called Total Security took over my computer. Not sure yet why AVG would not have caught it as it is updated regularly. Anyway, I tried to run Ad-Aware and it would not let me. Same with Spybot. AVG scanned and removed a couple items but upon restart the Total Security issues were all still there. Tried booting in safe mode and it blocks that too. Did finally run an AVG scan and it said it removed 3 items but now upon restart I find it gets as far as displaying wallpaper picture...bottom items (Start, clock, etc) start to display and disappear and it stops there. Not longer have any icons...just the wallpaper picture. I had disconnected everything and hooked it up at a different location and it did start ok...so I ran AVG scan again...said found items again and upon restart when finished I am back to just wallpaper. I tried booting from disk to do a scan with Norton SystemWorks 2004 disk where it scans for viruses before downloading and that scan showed no viruses. Tried restarting in safe mode and still cannot. Anyone have any suggestions if I can do anything from this point??

Any help appreciated!