Hello MDL , I need your help please, I tried today to install windows 8.1 but occurred a trouble: in the step when to choose a drive for install there are such things: Drive 0 Partition 1 - 100MB system Drive 0 Partition 2 - 128MB MSR (Reserved) Drive 0 Partition 3 - 100GB Primary Drive 0 Partition 4 - 197GB Primary (that last one is my Data repository) when i choose 3rd one (100GB Drive) there was error mark below: ,,Windows can't be installed on this drive. The selected disk is of the GPT partition style." same to other partitions too. also to my boot priority in BIOS is strange things , see below a screen shots. there is no even usb option to boot from it. what is that any help will be appreciated. Thanks in advanced.