Hi, previusly i tried to instal udk 4 in my second partition D: , it doesnt work because i dont have enough space, then I erase all my partition D:, then make a big particion joining C: and D:. Now i tried to install again and pop up this error. The program tried to install in D: but this partition doesnt exist any more, now there is only C: partition with 50 gb space free. I deleted all the entries in t
he registry ( regedit) and every folder from epic games etc.
Well as you may notice you broke installation and installer still thinks that engine is installed 
you need to wipe Unreal Engine register entries, there software that might fix that mess
I bet you can find other software like that , if those wont work (and they might not work because you been messing with registry) then sorry to say but most likely you will need to format C and install Windows from clean. You might try to find installer on C too (but try that software i did point you to first)
Thanks for you reply, now format c: because now i broke the installer thanks again!
