Have you tried installing cod2 and mod tools normally?
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You tried the Compatibility Mode already like Mitch suggested?
Thank you all, who helped me.
But I gave up, I refreshed my Computer.
From Windows 8.1 to Windows 8, only the installed programs I have to install again.
That will take time, but it's better than find the reason why it don't work.
Now I have reinstalled my Computer, all files are here, but I have to install all programs again. Call of Duty 2 Compiler works, I have learned that I will never install Windows 8.1 again.
I want to get inform by a guy who will install Windows 8.2 (probably it will come soon) and say me, whether all works fine.