Hi,
Since CSC.exe is related to the Windows Framework, please reinstall the Windows Framework component. Meanwhile, you’d better scan your system and remove the malware in time.
If this issue persists, you may have a try with the following methods and let us know the results.
Here are two articles can be referred to.
csc.exe
http://www.dllsuite.com/Windows/Windows_7_Professional_Edition__64-bit/list_c/csc.exe.html
Csc.exe error message
http://uk.answers.yahoo.com/question/index?qid=20100129140229AAyDsxi
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Hope that helps.
Ivan-Liu
TechNet Community Support
