Help How to reinstall the software?

[fruitloop]

Hi,
I have a galaxy s. I has had lots of troubles with programs crashing after I unlocked it and updated it. Now it will turn on, light up, but not bring me to the home screen. It vibrates and gets stuck.
I want to reinstall the software to see if that will fix the problems. How do I do that? Is it even possible?

Cheers,
Dasha

 

[robogo]

You mean, flash a ROM from scratch?

Pleny of tutorials on the root section of the Galaxy S forums.