GPT Protective Partition not readable help!

[edscdk]

I have a windows 8 pc that will not boot

I took the HDD out to read in another pc

the other PC sees the drive but no partitions

disk manager shows "GPT Protective Partition" with no options to do anything (they are all greyed out)... a mac just says the disk is unreadable

any tricks to sort this?

 

[edscdk]

W8.1 on both

 

[edscdk]

Both 64bit 8.1 both uefi,