Problem With Changing Resolution

Ok basically I have had nothing but problems with Dell for 6 months so I am just giving up and not even bothering to try contacting them yet again, recently I sent them my laptop to have it repaired after I kept receiving a blue screen error, they have just returned it having re-installed the operating system but almost nothing else. So I have had to install the drivers for my graphics card so it would detect and use it, instead of just assuming I had a "standard VGA" or something similar which is what it was doing.

However, when I go to my display settings I am unable to set the resolution any higher than 1440x900, where as before sending the laptop to be repaired I was able to set it much higher and I preferred this, how am I able to fix this so I am once again able to set the resolution higher.

The laptop uses the following, if you need more details let me know:

17.0" UltraSharp¿ Widescreen WUXGA (1920x1200) TFT Display with TrueLife¿ (Wide Viewing Angle)
NVIDIA® GeForce¿ Go 8600M GT with 256MB DDR2 dedicated graphic memory

Also on a side note the touch-pad on my laptop no longer allows me to scroll up and down or left and right as it used to if I moved across it close to the right or bottom edge, it is intended to do this as there are even small drawings on the touch-pad showing where to touch to scroll.

Thank you very much in advance to anyone that reads this or helps.

Tom C-B

As far as I know the drivers are updated, for my graphics card at least, after half an hour the Dell guy did eventually lead me to their site where I could download the correct drivers for my graphics card but I will check on the site you provided in case Dell were not up-to-date which would hardly surprise me.

All this means is that drivers need updating... i can't for the life of me remember where i updated my laptop drivers from i'll do a bit more perusing then edit this.