SCCM Attempting to load a 64bit application, however this CPU is not compatible with 64Bit mode

I got this error when PXE booting a machine and solved it by re-advertising a task sequence that uses the x86 boot image to our unknown computers collection.
The last one I advertised to this collection was a few weeks ago and as far as I remember was an x64 windows 7 TS.
This is strange behaviour but I guess it stems from the fact I have both x86 and x64 boot media advertised to the same collection, I really should look at creating 2 seperate collections for this......

Cheers

Task Sequence has failed with the error code (0x80070070).

If you get this error during a task sequence simply hit F8 to bring up a command window (if you have command support enabled on your boot media) and use diskpart to clean the disk. The following commands should do it:

Diskpart
List disk
Sel disk X
clean
exit

Cheers