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I get a Windows 10 error when executing SARMCM3.DLL in Keil V4.60. On the first debug session all works well, but when I quit debug, compile the project and resume debug UV4 is closed. Winodws log reports Exception Code 0xc0000005. When I run Keil V5.25 all works well.
Try the current uV 4.74 http://www.keil.com/demo/eval/armv4.htm
My current version (V4.60) is a Professional license, which is not able to be upgraded, I think. It seems that my problem begin after a Windows update. Version V5.25 is a ST limited to STM32F0 256K only.
In that case, you can contact Keil support direct.
Keil has a direct support structure, this is a user-to-user forum. See notes here http://www.keil.com/forum/
You can install different versions in different directories.
If the version you have is broken in Win10 your options are to install a version that fixed those issues, or use Virtual PC to run an older OS version. Best not to install a new OS on your primary development machine, Microsoft has a history of breaking and discarding things leaving a trail of wreckage decades long, and thousands of developers wide...