It sounds like your computer is infected by Antivirus2008 virus. Check http://www.symantec.com/security_response/writeup.jsp?docid=2008-050906-3727-99&tabid=1
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>I had to re-format my HDD on Saturday. Now I am not able to access the Task Manager, getting the message "Task Manager has been disabled by your administrator.", well, I am the Administrator and have confirmed the user rights.
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>Something else, Skype is hogging CPU/Memory, can't confirm which as I do not have Task Manager access.
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>Same hardware, softwares and operating system yet what changed?