Thanks all.
My hassle with OEM is that twice I have gone down the pan.
The first time was "TIME" machine, a reload disk failed and I could not get a service because they had gone out of business.
At the present time we have a laptop as well, W7 supplied by Amazon, (Toshiba 17.3" screen) that reload disk has also failed and Amazon do not give any service,(The did give me a £100 refund to get it put right). So I have instructed the builder to install a supplied version with disk and not OEM.
But I am looking forward to my rebuild, 8gbs of ram , quad processor AMD, and a 1gb video graphics card. Should make the Apple boys cry in their beer. :wink: