The file c1_arm.dll is a part of Microsoft Visual Studio’s Visual C Compiler Front End. In simpler terms, this dynamic link library belongs to a program that turns programming language into machine language.
Generally speaking, unless you are a computer programmer, this file should not have any business hanging around on your computer. If it is there, though, and you get an error message with it listed, you might have a program that is relying on some of the information in this file.
If you are running Visual Studio on your computer, you might be able to fix this error by reinstalling the program. While that could solve it, it could also wipe away your work.
In either case, whether you are running Visual Studio or not, if you get c1_arm.dll in an error message, you could simply run a registry cleaner. ZookaWare PC Cleaner offers a guarantee, and your money back if we don’t clean up your registry.