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i said do them in order. So ignore that and do this:

1. go to your anti-virus settings and uncheck the box that says "Launch on Start-up".
2. restart your computer.
3. run cabal manually with...

Read post 2 very carefully and follow the steps:

http://forum.cabal.com/showthread.php?9922-Cabal-Login-Errors-(READ-IF-YOU-ARE-HAVING-THESE-PROBLEMS)