My daughter's Dell laptop was recently "cleaned" of a number of trojans. Now it will connect to the internet with AIM and Yahoo Messenger and accept program updates from download - but the laptop won't launch Firefox nor IE Explorer. Also - I've tried to use HiJackThis and Malwarebytes to get a log of running applications and do more clean up and it shuts those programs down. I'm out of ideas short of reinstalling windows. Any suggestions would be appreciated. Thanks.