One thing I must mention to you as you haven't replied yet. If your version of windows is one you got preloaded on the PC it may be locked to the motherboard. If it is and you replace the board it may fail to validate, it may not it could be ok but you would be better to check just in case.
Totally-braindead and Fruit Bat/\0/\. Thanks for your replies. Yes Tb your presumption is correct just upgrading the board and cpu with the os Win xp home taken from the old case. The win xp was not preloaded as we have the full disc. FB, Thanks for the info will have a read and try to digest before i attempt the transplant.