I was doing a search on his problem with the control panel, etc. and someone said that spybot made their computer do that from some settings in advanced mode:

"
after seeing your posts (and finally twigging onto the idea of what i had done) I opened Spybot search & destroy and went to
“TOOLS”
then
“IE TWEAKS”
(both available in the program’s advanced mode)
and unchecked the 3 options of locking the host file…, locking the start page…, and locking the control panel…

all’s fine now. "

Does avast have an option like that too? Maybe that’s why it did that to my friend after he ran avast. Maybe he just needs to mess with the settings. Is there a setting for that?