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I have my boot loader.It works but this code was my mini kernel code.The bootloader loads it succesfuly but minikernel doesnt work properly...
What I must to write in tmy code, maybe the mini kernel now works in protected mode, I heard something but what is it at all?

Please write me ...

I think the problem might be you're loading the kernel and execution of it is starting at 0x7c00 where a message string is, not an instruction! So in fact, the bootloader might be in fault.

The kernel can't load at 7C00h, because that's where the bios loads the bootsector. If the bootloader is loading the kernel at 7C00h, then it is overwriting itself.