Uninstall everything 'McAfee' via Control Panel/Add or Remove Programs (XP), Programs/Uninstall a Program (Vista/7), run the MCPR cleanup tool listed under Useful Links at the top of the page and reboot.
Reinstall your suite from your online account after running the Preinstall tool: http://download.mcafee.com/products/licensed/cust_support_patches/Mcpreinstall.e xe
I and the Technical support did this 3 times yesterday and it still does the same the only solution was to uninstall Site Advisor and now the programme works perefectly scans and does updates without having to reboot. I am just concerned that I dont have Site Advisor installed
That's weird as I can't see how SiteAdvisor, which is purely a browser add-on, could interfere with VirusScan at all.
Perhaps you should reopen the ticket with Technical Support and ask for escalation.