install teamviewer, free utility that will give you total remore control over your computer - from anywhere and pretty much any device.

It's free, it doesn't go through a 3rd party server and it works brilliantly. (even with linux :-) )

It's what i use for remote support for my clients.
www.teamviewer.com

It's hilarious that mj's first thought is to whip out his soldering iron and start attacking the computer motherboard. Particularly when the seril headers are still included on motherboards. If you want a physical serial port you can just buy one and plug it in. No soldering required.
Even the latest boards I use still have serial connectors - you just don't get the cable and socket in the box.

But in your case, teamviewer is most likely the better bet.