Windows is locked up at welcome screen

My dell inspiron laptop was working fine, I was using Adobe Lightroom when it gave me
An error prompt and shut down. I tried rebooting the computer in safe mode and regular mode, no matter what I do I reacts the same. Takes me to the login screen where I am able to type in my password, then it goes to the welcome screen and stays there. I have a lot of work on this computer and it hasn't been recently backed up. Am I going to lose all my information and what should I try next?

Yes I do have the windows 7 discs. Will this delete my data?

I have 1 windows 7 re-installation disc and a dell application disc and a drivers and utilities disc.

It's the disc that came with the computer. But after more research I've decided to Lena professional handle this. I'm afraid of messing it up even more. So in the morning I will be taking it in, in hopes of recovering some of the information before I damage it anymore. Thanks for the help!