Hi , I have to install a new mobo in my desktop due to failure , as it's pretty old i can't use a like for like" board -it made sense to go for an upgrade. I've gone into the subject of replacing the hardware in a different thread on the relevant Hardware forum but before i go ahead i want to get the issue of reinstalling the OS clear in my mind . Windows XP Media Centre Ed 2005 was installed on the original system - which was ( ahem) Emachine ...no jokes please i've learnt my lesson . Anyway i have the Op system Disc that came with the system - can i use this to reinstall after i install the new hardware ?I've read there could be problems caused by embedded drivers on this disc which could conflict with the new mobo ? I'm a bit confused by the whole OEM software issue and getting authorisation from MS - some people seem to say there is no problem but others say it can't be done and you have to buy a totally new XP disc . Can anybody please enlighten me -i realise this question must come up frequently with people needing to upgrade a mobo and reinstall the OS . Is there any way it can be done with this Disk or i do have another XP disc from another older system that went out of action a few years ago - this is also XP but Professional 2002 Ed (inc service pack ia) . This disk does state that it is for reinstalling OS software & does not include drivers -would this disk be ok to use - the only thing is i can't lay my hands on the Cert of Authentication Label that came with the XP Pro CD . I bought this Disk from a tech engineer -i still have the packet & Manual with the Disk in a sleeve .