Dell Dimension E521 Startup Bluescreen

What is the Error number?  Does it bluescreen as soon as it starts Windows? or after it starts?  Can you start in Safe Mode (Press F8 BEFORE Windows starts to load).

I can get into safe mode by pressing F8 but when doing a regular boot it shows the xp boot logo and then the error screen with the following screen details:

A problem has been detected and windows has been shut down to prevent damage to your computer.

If this is the first time you've seen this stop error screen, restart your computer.  If this screen appears again, follow these steps:

Check to be sure you have adequate disk space.  If a driver is identified in the stop message,  disable the driver or check with the manufacturer for driver updates.  Try changing video adapters.

Check with your hardware vendor for any BIOS updates.  Disable BIOS memory options such as caching or shadowing. If you need to use Safe Mode to remove or disable components,  restart your computer,  press F8 to select Advanced Startup Options, and then select Safe Mode.

Technical Information:

*** STOP:  0x0000007E (0xC0000005, oxF6BD0756, 0xF78A242C, 0xF78A2128)

This error "007E" can be hardware or software (Windows registry) related.   If you do a google search for the 0x000007E

you will find this is a common error.  

First suggestion is to run the Dell hardware diagnostics by pressing F12 at power on and then access the diagnosics.  If nothing shows up there, consider running a Windows XP "Repair" which is similar to reinstalling XP from the CD except you select "Repair".

I have a Dell Dimension E521 that when I start it up it gives me a bluescreen and an error number,  How do I fix this.  Was it a driver I installed?

My relative's 5150 (E510) would run, but it was unreliable and slow. After I replaced the power supply, all was well.

The power works and my harddrive works so i think it is a bad driver.