castsrv.exe is a application which is probably legit. So, if castsrv.exe is on your computer, it is probably ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to run a good antivirus with a good track record, in order to yourself your PC against potential security problems.
This application is normally found on disk in C:\Windows\System32\CastSrv.exe.
The MD5 checksum for this executable is b21e908547bf5ea9c53b43b2031c0d14.
This application is NOT a Windows service. This is good.
castsrv.exe appears to use the functions of Windows SFC (System File Checker) or Windows File Protection.
64-bit code has been detected. This program can put to good use the full power of a current PC processor.
This executable does NOT have visible elements of user interface. This is most likely a bad sign.
castsrv.exe has a digital signature. Today the large majority of virus-free software applications are digitally signed.
The digital signature extracted from castsrv.exe is valid. This is most likely a clean, ok program.
Digitally signed by: Microsoft Windows
Certificate's issuer name: Microsoft Windows Production PCA 2011
This executable does NOT have a removal routine stored in registry.