Moving this from Help to Home General Discussion for attention.
If you just bought it there is 30 days free phone support.
Canada Canada - English 9:00AM to 6:00PM CST Mon - Sat 866-622-3911
Unsure if free call worth a call to ask.
Re unisnstall did you follow this FAQ to uninstall?
Just spotted this and hope that you are OK now, however I should point out one thing. Windows Defender is integrated into Windows 7 and can't be uninstalled, but can be disabled or turned off if necessary.
From my own experience it shouldn't be necessary to do that however, I find that it doesn't interfere with McAfee at all.