Having had loads and loads and loads of issues trying to activate my ex's dell dimension 5100 I realised one little problem i forgot to get rid of. The iso I was using had already an activator in it and would screw up the boot before 1.5.5 could get to it. Removed the oem crap the person put on it, removed all autounattend stuff and used 7loader 1.5.5 daz in older version and BINGO it worked. Now I'm off to eat some humble pie.
Yeah a good lesson learned always try and download original MSDN versions saves you a lot of work in the long run glad you got it sorted out