Blocked e-mail box

I recently removed McAfee virus protection from my computer and after I did that, I am now unable to access my e-mail mailbox. I can get to my servers home page, but when I log in, the log in window keeps coming back up. I was told by my server that McAfee left something on my computer that is blocking my mail box. When I went to the McAfee website to tell them of the problem, their tech support download took 3 + hours to download, and was still doing it. Does anyone know how to fix this problem? I can get my mail at mail2web, but all my addresses are in my servers mailbox area.