A couple of things to note:
1: IE, any version to date, is unsafe to use for any extended period of time. Replace it with something like Firefox or Opera, and reserve IE ONLY for those rare pages that won't work with anything else.
2: McAfee is crap. I could explain why, but the long and short of it is that it's crap due to being a huge resource hog.
3: Your problem isn't virus or spyware related, though I can see why you might think that being an IE user. It's just an advertising script gone awry. If you used Firefox, with the NoScript plugin, you could just block all scripts from googlesyndication.com and never have to worry about it again. I don't know how you'd go about doing that with IE, because I try to avoid unsafe things as a general rule.
I have a new desktop running Vista and IE7. When I try to access websites from my Favorites menu I briefly see my desired webpage popup, and then the page jumps to google searching for this: http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-9743864042528336. What in the heck is going on? I subscribe to McAfee Internet Security and scanned for viruses and nothing. I also downloaded and ran Spybot Search & Destroy and found nothing. If it isn't obvious, I know very little about computers, so please go easy on me! Thanks in advance for your help.