DLL error in two sepearte games...Help Me?

[Borske®]

I get this error when I try to run Project IGI or B-17. "the .EXE file is linked to missing export DINPUT.DLL.Direct Input Create Ex"
Now I have no idea what that actually means but I downloaded the DINPUT.DLL and put it into my windows and into my game directory and still it wont work. I even reinstalled the games after I put the DLL into windows. Is there a fix to my problem?
Thankyou in advance.