Please do the following:
Click Start>Run and copy/paste the following bolded text into the Run box and click OK:
C:\Qoobox\ComboFix-quarantined-files.txt
A report should pop open for you. Please post the contents in your next reply.
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What antivirus do you have installed? You're showing Norton in your add/remove programs, but there is no indication of it in your log?
Has it expired and did you uninstall it?
If you need another antivirus, download ONE of the following, update it and run it...post the log
(If you are happy with Norton, update it and run it)
Avira AntiVir
Avast
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Update your Spybot Search and Destroy, run a scan and post the results