I had a trial version of Avast antivirus which expired last week. So i went onto cnet.com and found one of the best free antiviruses listed (Threatfire) and downloaded it. I shut pc down and the next day tried to GET online and the mouse moves but no matter what i clisk nothing opens.There is a warning at the bottom of screen saying "your pc might be at risk -no antivirus has been started.Even though i had threat fire on i couldnt start it. So now the only way i can get online is through safe mode with networking and logging in as administrator. So now in safe mode i cant start the antivirus either! What can i do to fix this, get a antivirus started and be able to log in normal mode???Did you uninstall Avast?you might want to try a system restore to see if you can go backwards to the time before you started getting the error.

if it doesn't work, nothing has CHANGED. If it WORKS, you might be able to get your computer working enough to be able to see if you can get the malware specialists to help you see if it's in good shape going forward.I did uninstall Avast and i tried system restore and no changes were madeI'm not FAMILIAR with Threatfire. I'd suggest this: in safe mode uninstall Threatfire and install some other GOOD av (Avira, AVG, or even better, something you have to pay for). Then try to reboot to normal mode and see what happens. Also, once you've installed the new av you might want to run a FULL scan with both that and with MalwareBytes to make sure you didn't pick up a nasty somewhere along the line.