Zero key restores Windows Explorer

[iponk1322]

Hello, I have an annoying problem with my Windows XP. Every time I opened the Windows Explorer and put it in the background and I typed 0 (zero) on every software in the foreground,
the system automatically bring the Windows Explorer to the foreground. I don't know what's wrong.. If I close the Windows Explorer, then it all back to normal. I can typed '0' (zero) as usual.
What should I do to fix this?

 

[Cyberat_88]

You will have to methodically check all Hotkeys programed in control panel and otherwise windows. The "0" key is definitely set to bring up the app. or set active windows. Worst come to worst, it maybe a registry set function, do not mess with that yet.