My apologies, Phineas - Xp SP3. I had all frameworks installed up to 4.5 and decided to dispense with the earlier ones on the (wrong) assumption that Bill would have built in 'backwards compatabilty'. Now I need 3.5 for something. Since I could not install it, I tried 1.1 (as you imply) That is ok but will not accept SP1
The question is- do I need to remove 4/4.5 and start again? If I do, what functionality will I lose - eg will M$ update still work? Will browsers still function?