Palm Vx not connecting with computer and not charging properly?

Hi,
I have a Palm Vx, and I wanted to put it good use, so I got it out from my cupboard and...
I can't get it to work. It only turns on when it's charging, when I take it off the charger, 5 seconds later, it dies. Also, when I try to sync it with the computer, it comes up with the message: The connection between your handheld device and your computer cannot be established.

I am plugging it in by 9 pin serial port on Windows XP, I don't think the serial port is active, because when I go; Setup \ local. There is no com port that can be selected!

Please help!!!
NM