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When open the keil it always show massage "KEIL has stopeed working"

Please help me. I am so desperate for knowing this issue cannot be fixed yet until now.

Well, about 6 months ago I installed KEIL v4.20 from CD Nuvoton and it worked well. And after 3 months later I uninstalled it because I thought I didn't need it anymore.

But now I have to use this KEIL for my final year project. So my mentor give me MDK412.exe from RED BULL board. But it didn't work from the first time I want to install. It said "Cannot load license.rtf" and said that folder might be used and don't have free space. But I think my C:\ is free enough. I thought maybe it because the file in the registry, so I open regedit and search every registry whicg contain KEIL and then I deleted it. But it didn't help though. And wen I ask my friend about that, they have some problem too.

So I borrow from my leturer the Nuvoton CD, trying to install from that because it worked well before. And it work!I can install the KEIL to my laptop. But the problem comes, when I try to open it, It always show a massage " KEIL has stopped working..... Windows has checking the solutions" . I try to uninstall, install, use cc cleaner, AVG fix performance but it doesn't work. But my friend can open it, so maybe its my fault.

Please help me how to fix it. Maybe it because I touch the regedit? Please.

Thank you very much.