Satellite Pro A120-145: yellow exlamation mark in the device manager

Hi all,
I have a Satellite Pro A120-145 running Win Xp Pro fully patched and up to date, I have a yellow exlamation mark against "serial" in non plug and play in device manager (when i click show hidden devices).
Could anyone tell me which driver is needed for this? I don't want to use the recovery disc as I have done a custom install to get rid of excess baggage which is included on the disc.
thanks in advance.

That troubleshooting guide that Juan28 posted is really good. If the driver of the unknown device is already available (i.e. after the recovery CD installation) you might find your way through.
In case you can't locate a suitable driver for your unknown device on your Laptop, you could try and download a freeware called "Unknown Device Identifier" from this site:
http://www.zhangduo.com/udi.html
This program will allow you to locate the device ID and make a search with it on the Internet.
Hope this will sort things out.
Regards
electrochain

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