Hi - I have a similar problem.
Mine is a HP Elite 8000 with the Intel Core2 Duo CPU - E8400 3Ghz. Currently running Win 7 Pro (32 bit).
Windows 10 update fails as - it claims - the CPU doesn't support enabling the NX bit.
The Intel website says that it does.
I've updated the BIOS to 786G7 v01.14, rebooted, gone into the F10 setup but cannot find anyway of enabling the NX bit.
Anyone found an answer to this?
Thanks,
K.