Question Windows UEFI mode

UEFI includes the way the drive is formatted. Old style BIOS mode must be reformatted and partitioned if you are to run in UEFI mode. Most motherboards do have a hybrid mode available where you can set it to allow either (not mixed on one drive, but if you have more than one drive, then it would work with either style of partitioning). Assuming a purely UEFI mode, and a purely old style BIOS drive, then there is nothing you can do without deleting the existing drive content and repartitioning with a UEFI scheme (old style BIOS partitions are not detected by a purely UEFI BIOS).
 
when i try to switch to UEFI mode i always get back to the bios
how can i fix this?
You have to check partitioning style of your OS drive.
If OS drive is partitioned in MBR, then you have to convert it to GPT, to make UEFI compatible.
This can be done with mbr2gpt utility.

Please show screenshot from Disk Management first.
(upload to imgur.com and post link)

Why do you want to switch to UEFI?