Computer won't boot up all the way...... can't make it past the Window

Hello there. I have a 7 year old Dell Dimension 2400 computer. It has Windows XP(32 bit) with 4 gigs of ram.

Recently I have installed several new software programs. Mostly utility applications and stuff to play video files. Things of that nature.

My computer froze up yesterday when I had a few applications running. I let it sit there for a while and it never unlocked itself and would not respond to anything I typed on the keyboard. I turned the power off and then turned it back on.

When I turn the power on it starts up the boot process. It displays the manufacturer information, then it goes to the Windows page, then I get a green screen of death, then it goes to a black screen with white text telling me that my system has crashed and asking me if I want to start up in safe mode or regular mode, etc. I have tried safe and regular but neither one will boot up beyond the Windows XP screen.

Any ideas on how I can resolve this? Do I need to create a CD boot disk and try to use that to load Windows properly?

Thank you so much in advance.

TC