When I first changed to an LCD screen, I was disappointed because, as you've found, the display isn't as good as a CRT screen.
There's some things you can do to improve it though. If you have DVI connections on both the screen and the PC, try using that instead. You may need to consult the manual for your monitor in setting it up.
The other is to turn on ClearType:
http://www.ssiweb.co.uk/website-design-68/knowledge-base-111/116.htmYou should also set the PC resolution to match the optimum for the monitor.