To quote The Hitchhiker's Guide to the Galaxy:
Don't Panic!
Now, there's no virus at play here, there is nothing nefarious happening on your computer. Well, mostly nothing nefarious.
What's happened is at some point you've gone to the iGoogle page and it's dropped a cookie on your system that says you'd prefer being taken there every time you go to Google.com rather than the austere Google home page.
Fortunately it's easy -- I mean really easy -- to fix.
Go to http://www.google.com/ and you'll be whisked magically to iGoogle. On that page, on the top right, you'll see this:
Click on "Classic Home" and everything will be as you hope.
Want to change back because, well, that "Vanessa" theme is a good distraction? No worries, on the standard Google home page move your cursor to the top right and you'll see:
Click on "iGoogle" and you'll find it's been reset.
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These directions are not entirely accurate. From the iGoogle page, you must click on the little symbol that looks like a wheel in the far upper right-hand corner of the screen(when you hover over it, it says "options"). A drop down menu will appear, and then you select Classic to change back to the traditional Google page.