Have you tried running the adware se and norton in safe mode? Sometimes programs that can't be removed normally can be removed in safe mode, because the malicious processes can only run during normal operation.
If you don't know how to get into safe mode, follow this tutorial:Safe Mode
Are you running with windows xp? I'm no expert, so if the adware and norton don't work in safe mode, you should probably post a hijack this log in the appropriate forum:Hijack this! Forum
And, here is a step-by-step guide to preparing a hijack this log:Hijack this! preparation
I know that this is a lot of reading to do. But these people are experts (unlike me!) who will do everything in their power to free your computer of the infection.
BTW, after you post a log DO NOT REPLY!!!!
If you reply to your log and ask why no one has responded, then a hijack this team member will assume that you are being helped, and will not look at the log. Just be patient! Lots of other people need help too!
Hope your problem gets resolved!!!