The Photoshop Installer should have a Repair Option. You can run the installer and give that a try.
Okey, so where do I find that option now?
I will have to dig up my installer (a.k.a. setup.exe). In the meantime have a look at this document:
I finally found my install folder. The earlier versions before CS6 used to have a "repair installation" option. Not this one. The only option would be an uninstall/reinstall.
You would go to the Control Panel > Programs and Features > and uninstall Photoshop CS6 from there. No need to deactivate. Then reinstall from your cdrom.
You may want to peruse the troubleshooting link I gave you and leave the reinstall as a last ditch option.
I can't reinstall from a CD because I bought this directly from the Adobe online store, and I was given a serial number to download the program(s) I bought.
Also, I bought Photoshop in a package along with InDesign, Illustrator, and a few other smaller programs I think. I don't know if I can download Photoshop on its own.
I downloaded the stand alone Photoshop program and found the setup.exe in the CS6 folder. I selected the "I have a serial number" option,entered my serial number and selected "custom install." The problem is that I do not know how the Suite installer works.
I also do not know if you can download the trial version of stand alone Photoshop CS6 and use your Suite serial number on it. I would think it might reject the serial number. I do not want you to have more problems because of that.
If no one else here can help you on this,you should contact tech support and ask them how to reinstall Photoshop only from your CS6 Suite.
What OS version are you using?
What does the crash report say?