pjz99: I'm also working with WinXP 64 bit. The ntdll.dll file should be in WindowsSystem32, in my case the version is 5.2.3790.4455 (size 1,20 MB) - seems to be the same like yours except yours is branded as a "faulted modul". In any case I would copy it from the Windows install CD (where you have to find ntdll.dl_ or some ending like that)  and replace it to exclude that as a mistake. 

I cannot help with your Adobe Flex problem because I'm working with PP2010 that has both Air and Flex from Adobe and I'm glad that works... well except when I was not connected to the internet because then I had a similar message like you only it did not crash and when I clicked it away the library opened, but that problem was solved after a restart of the PC when I remember correctly, anyway your problem seems to be much heavier.