Your story seems remarkably similar to yesterday's story in http://forums.cnet.com/5208-6122_102-0.html?messageID=3198456#3198456
So it could be Grif's suggestion there will help you also.
I have had numerous issues with some malware. It disabled malwarebytes. In order to save time and not list all that I have dealt with and have fixed, I will start describing where I am at right now.....
Note this first: I did an AVG scan and it found 7 trojans. It placed them in the vault. It said reboot, so I rebooted. I believe that is why I can not get my pc to go past the windows screen.
I tried rebooting multi times, but the machine can not go beyond the 'welcome screen'...............
MALWARE messed up my safemode, so I can NOT log into safe mode. TO make matters worse, when I boot up, my system is stuck in the "Welcome screen" (blue) - I click on my user acct (only one that I have), and it starts to say, 'loading your personal settings'. I get a split second view of my wallpaper on my desktop. But then it goes back to the welcome blue screen...Then it says 'logging off' under my icon user name acct..It wont log off/turn off unless I manually click the 'turn off computer' icon red button on the bottom left corner.
SPECS: Windows Home edition OEM sp2 IE7-HP pavillion 8100 laptop-
I have the original sealed discs that came with my 4 or so year old Laptop.
THanks in advance.
Please use easy terms and step by step. I dont want to mess things up more than what there are....