i managed to sort mine out due to this post last week. I then tried to update itunes on other pcs & a netbook in the house. They all run windows 7. 1 of my sons worked no problem, the other pc ( same make) and the netbook all had problems and i had to resort again to uninstalling the above.
So there is obviously a problem with some machines and not others. which seems very streange how 1 pc woudl auto update with no problems but the other 3 had different problems.
But again thatnks to this thread i knew exactly what to do
so thanks guys & gals for your help xx