Right Click Menu/Pull-Down Menu Problems

I recently bought a new laptop that came installed with Windows 7 Home Premium. For a few days, everything was fine; I transfered over some files, downloaded the usual programs, installed required updates, etc. Then, this happened: (Refer to attachments, I guess...)











Image 1 is what happens when I right-click the desktop.
Image 2 is Chrome's menu.
Image 3 is Firefox's menu.
Images 4 & 5 are Paint, what I had to go through to save these screenshots.

Apparently, this is only a problem with my User Account. The Guest account seems to have no problems akin to this in the time I spent over there.
Now, being the perfectionist/idiot I am, I ran System Restore twice. The first time mediated the problem for around 30 minutes, and the second time 5 minutes.

So, I suspect the problem lies in something I transferred over, but since this is a new computer/OS, I have no idea.

Any help would be appreciated. Thank you very much.

Thanks for the replies. Changing the themes seems to work. The thing is, I am the only person using this laptop, so the fact that something like that changed without my permission is unsettling. I am well aware of Microsoft Security Essentials, but my computer came preloaded with a free 12-month trial of McAfee. As much as I hate the product, it's free, so I thought I'd just abuse it for as long as possible. Would it be sensible to uninstall that and install MSE in its place?