My Computer will turn on and go to the windows XP loading screen with the blue bars and will won't load up, it rarely does but when it gets to the log on user screen it freezes

You may need to check to make sure Windows XP was installed properly, if the computer had crashed, you can do a repair, I am a computer technician, and I can tell you, that replacing the power supply will not do that.

This might happen if you install McAfee with applications running, or not restarting Windows, etc. I am not sure why you couldn't boot in Safemode, booting in safemode is exactly what you need to do to uninstall McAfee.

Try start up in Safe Mode press F8. Choose Safe Mode, when at the choice window, to select either Safe Mode Desktop, OR System Restore, chooses system restore and choose a time before you had the "Problem" and follow instructions. This should get you back.

you are most likely getting a BSOD with a stop error code of 0x0000007B which is caused by the Windows XP CD that you are using doesn't have the SATA Hard Drive controller driver needed to recognize and utilize the hard drive. If Lenovo has XP drivers for this model then they should have a SATA driver (roughly 394k) that will need to be loaded FROM A FLOPPY DISKETTE during the boot to XP. (XP Requires the driver to either be slipstreamed into the CD or loaded from a floppy diskette. Trying to load the controller driver USB or a different CD will not work)
http://www.digitgeek.com/how-to-slipstream-sata-drivers-into-xp-cd/

IF U CAN GO INTO BIOS GO IN BIOS AND CHANGE FIRST BOOT ORDER TO CD ROM THEN PLACE XP CD IN CD ROM AND RESTART PC. AND REINSTALL WINDOWS..........

maybe your computer might at risk such as your computer might have a virus or worm...

See if you can boot in safe mode. Turn on computer and repeatedly press F5, select the safe mode option if you can get in then the problem might be you have too many start up programs trying to load when windows start. Find out which ones you do not need and prevent them from starting up when you log on.

When You Boot up your screen goes in to the windows xp loading bar and after a quick blue flashin screen pops up and it restarts unfortunately this is what they call the Blue Screen of Death so more than likely you harddrive with the os is corrupted so either you will need to reload the OS or by a new harddrive and load the Os on that Harddrive

start up windows in safe mode and see if you still get the problem. did you use the same vga cable???

Sounds like both of you have what is called 'Microsoft Blue Screen Of Death' and is irreversible, but is fixable at the same time. If you need files on your computer then follow these instructions

1. Turn on computer and Insert Windows XP Installation Disc that came with your computer
2. Wait until it says 'Press any key to boot from CD....' and press any key
3. Wait until it comes up with prompts and choose 'Install Windows XP
4. Choose to install XP without formatting the hard drive and choose a made partition (C Drive) to install NTFS
5. Install and now your system will be working again. You will be prompted from now on though which Operating System you would like to use. Always select the first one
6. Enjoy

For if you want to erase the hard drive

1. Follow steps 1 - 3 in above instructions
2. Choose 'Format Hard Drive'
3. Select create partition in Hard Drive and set it to the maximum space and call (C)
   
4. Select NTFS and go through instructions
5. You won't be asked to choose a OS as there is only one to choose from
6. Enjoy

Hope This Helps