admin tab links on dashboard shift left

When I access my dashboard and scroll over any of the administration links using IE 7, the tabs all shift to the left, with the actual link still remaining in the same location. Thus, to access any of the tabs, I have to click about an inch away from where it appears on my screen.

Here’s a page with screenshots of the phenomenon:
http://www.reginarivera.com/wp_dashboard.html

This only started happening about a week ago. I haven’t added any new plug-ins, etc.; haven’t tweaked any of my blog files; and have only added new posts. I really have no idea why this started happening.

Any ideas as to how to fix this? It’s really annoying.

(For some reason, it doesn’t happen in Firefox, but I am not always in a situation to use Firefox.)

Thanks!