My mom just got a new Dell computer yesterday and was setting it up. She downloaded Firefox and went to try some games. The games require Flash player, and when she tried loading one, it said please install Flash. She clicked on it and it started downloading Flash + McAfee(she forgot to uncheck the box). When it got to 50%, it asked her to shut down Firefox so she could continue downloading. When she tried to exit Firefox, it wouldn't let her, asking instead if she wanted to cancel all of the programs that were downloading. When she tried playing games on IE, everything worked fine. She went back to Firefox and kept getting the message saying she needed to install Flash player to do anything. What could be causing this to happen? She doesn't seem to have the Shockwave plugin on Firefox, even though she has Shockwave player installed.