Cheap office system

[Kimi]

Hi guys, i hope you can help, im looking for a cheap as possible system that runs Windows 7 Professional, the machine will only be used for running tracking software for my business so it doesn't need to be super fast, it will just be sitting in the corner ticking over, id like to buy one from OcUK preferably.

Im not opposed to build it myself if someone prefers to specs parts and offers a considerable saving but prebuilt would be handy

Thanks