Windows 7: All maximized windows show upper portion of desktop above menu bar

Seen several different posts about this issue but really no definitive answer as to why is occurring. Never happened with XP or Vista only Windows 7. Seems most users with this issue report having a Dell computer but mine is a Toshiba Satellite L505. I just find it very annoying to have approximately half inch of desktop space visible on top of any type maximized window, browser window, explorer window, whatever. Did anyone every arrive at a resolution for this issue or what is causing it to occur?

you dont by any chance have an OEM windows disk bundled from dell? my gaming rig used to says its a dell, as my system builder version of windows vista is Dell branded... but still came as a windows disk oddly.. was an ebay purchase.. sooo go figure lol should tell you in system information or on the performance page.

Well apparently it was a simple as changing the personalization theme from Windows 7 to Windows Classic. The resulting page or window doesn't look nearly as nice but the gap on top is no longer there. Interesting that all of the other built in personalization themes leave the same gap at the top as well.