I just reinstalled McAfee (Total Security) to correct a conflict with legacy Norton utility last weekend. Two days later, I believe the computer was even used in an intervening day, Firefox (3.0.10, continuously crashed upon opening. I had never seen this sort of crash). It enabled info to be collected and sent to firefox. IE8 when launched, would start opening windows again and again, I race to kill them as they opened and succeeded and had about 10 window open at one time. I then launched Firefox in safemode, successfully. While doing so, I disabled all my add ins. I then one by one activated the disabled add ins and when I got to McAfee site advisor, the problem recurred. This coincided with IE8 issue. Now, I have uninstalled siteadvisor and all is working again. It was a very annoying hour or two and I have not heard anything about this. I am running 64 bit Vista Premium Home PC.
I found event log problems, but when I sent them to Microsoft, they were generic and suggested solutions, relating to running msconfig did not effect my issue, nor were McAfee involved.
SA may have been conflicting with another add on, but it was SA that caused the problem as adding everyone back, but SA, has the system running properly. Only readding SA, in the context of several others, brought the problem back.
All uninstall were done using Windows uninstaller utilities, not sure of other trustworthy ways to do it.
My system works. I uninstalled and reinstalled mcAfee total security and did not include SA and that is how I now run the computer.
This problem only arose after reinstalling mcafee following it being installed 2 months over a legacy norton scan utility. This impacted updating and some other sporadic functionalities solely related to Mcafee. So it may be related to an update that norton blocked.