CS4 suddenly stopped working

I installed CS4 7 months ago on a brand new laptop and it has worked perfectly until a few weeks ago when it suddenly quit launching.  It will only open partially--with the left sidebar showing and is unusable.  I tried uninstalling and reinstalling but it didn't help.  I contacted Adobe support and they said to come here or buy a support contract since CS4 is an old version.  Can anyone help me?  I am a professional photographer and need photoshop on a daily basis. 

Karin