Compilation Error: File being used by another process: FIXED

I’m trying to compile a single file, index.php containing this syntax:
Every time I get “The process cannot access the file because it is being used by another process”. I also get a different compilation error when trying to compile the sample program - “Device not ready”.

I’m using the latest trial version on Windows 7 Ultimate SP1.

Maybe some third-party program is blocking the EXE being created. Are you using any antispyware or antivirus program that could interfere?

Thanks - it was due to Microsoft Security Essentials “real-time protection” feature. I disabled it and it works fine now. Thanks for your help!