If you are running Internet Explorer 7 go to Tools/Internet Options/Advanced and click the Reset button. OK and exit, reboot if asked.
IE6 - Tools/Internet Options..
General tab: clear cookies, history and temporary files
Security tab: set all zones to default
Content tab: disable Content Advisor
Advanced tab: set to default. OK and exit.
Try disabling all pop-up blockers.
If you previously had McAfee installed then do the following:
1. Uninstall all McAfee programs through "Add or Remove Programs" in Windows "Control Panel".
2. Use the MCPR tool, see this article: How to remove supported McAfee consumer products using the McAfee Consumer Products Removal tool (MC... This will remove all McAfee remnants from your computer. (you must have Windows Vista, XP or 2000 SP4 to use this tool)
3. Launch Windows Explorer and delete all McAfee files in "Program Files" but especially in "C:\Document and Settings\<user>\Application Data" and "C:\Document and Settings\All Users\Application Data". You have to set Windows Explorer to show all hidden files and folders (Tools > Folder Options > View tab). Just delete the McAfee folders even if they are empty in all the "Application Data" folders. Can be more than one!
In Vista: C:\Program Files, C:\ProgramData and C:\Users\yourname\AppData\Roaming
4. Reboot and redownload/reinstall your McAfee products directly from your account at the McAfee web site.
If you download from McAfee directly then go here: https://us.mcafee.com/root/login.asp
If from Dell go here: https://us.mcafee.com/root/login.asp?affid=105
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