How do I increase display resolution to 1280x1024 on Inspiron 6000?

Hi,

 

I had to replace my hard drive and I'm having a challenging time restoring back to the previous configuration.  I currently have an Inspiron 6000 connected with a Dell 1905FP Monitor.  The Monitor works best with the 1280x1024 resolution, however I am limited to 1280 x 800 on the laptop.  I know this worked before.... my hunch is a missing driver (as that seems to be my theme problem).  Does anyone know how to resolve this problem?

 

Thanks for your help!

 

Emilie