My windows and central locking have a mind of its own! |:

Easy guys,

I drove home from work the otherday and as i went to get out of my car, i took the key out and had the door open, usually when i do this i wouldnt be able to operate the windows unless i put the key in again and put the ignition on, but as i stepped out of the car with my key in my hand, my windows decided to wind them selves down, then the central locking was trying to lock and unlock its self constantly :S but when i lock it none of these problems happen?

Any ideas? its a polo 9n btw, 2002.

Any help will be greatly appreciated, thanks.