Detailed information is needed before anyone can help you, such as:
Platform (Mac or Win)
Exact version (including dot release numbers) of Photoshop and of your OS
Machine and software configuration, including RAM, available disk space, etc.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
A system error does not mean the file is corrupted. It's either a problem with the OS install or some glitch or temporary hiccup.
If there are no privacy concerns, you can upload the file somewhere and post the link here. Someone can open it and resave it for you.