XP won't boot up fully with new MSI GeForce4 Ti4200 TD64

Here's the deal.  I had many problems installing any drivers for my new Ti4200 card.  I tried many different drivers but invariably always wound up with this message:
---Start---
Cannot Install this Hardware
There was a problem installing this hardware:
Video Controller (VGA Compatible)
An error occured during the installation of the device
The data is invalid
Click Finish to close the wizard
---End---
However, I looked around and found this solution:
---Start---
Why do I get "data is invalid" error when installing drivers?
This error appears to be due to a protection problem in the Windows registry under Windows 2000 and XP and can occur with a variety of drivers (sound cards and SCSI drivers have been reported). To fix this problem, go to Start, Run... and type "regedt32" without the quotes to run the Registry Editor. Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ENUM\PCI
and you will see a number of keys of the form "VEN_xxxx", where xxxx are strings like "1102&DEV_0004&SUBSYS_00011103&REV_04". Under each of these folders will be another folder with a long numerical name. Open each folder and look for the "DeviceDesc" which matches the hardware you are trying to install. Right Click on the "VEN_xxxx" for that device and select 'Permissions' and then tick "Allow" for "Full Control". Close Regedit and then continue with the installation of your device
---End---
I did that and was finally able to install the drivers.  Once that was completed, it asked me to reboot.  
Now Windows XP doesn't boot up fully.  It gets to the part where it shows the splash screen for loading Windows XP and then shows a blank black screen at the time I would normally see the blue background to login etc.
Anyone know what the problem is here? I think it might be totally unrelated to my driver installation problem. The only thing I could think to do is upgrade my power supply but before I do that, any ideas?
Any help would be greatly appreciated.

Here's the specs on the power supply:
AGI HEC-300AR
AC Input: 115/230V  50-60Hz  6/4A  Fuse Rating: F6.3AL/F6AL.250V-
DC OUTPUT  +3.3V  +5V  +12V  -5V  -12V  +5Vsb
MAX.A          20A      28A  12A    .5A  .8A     2A
+5v&+3.3v Combined      165W Total Output 300W
Hope that tells you what I need.  Just looks like random numbers to me.
Richard,
SB Live is in slot 4, how do I set it to IRQ 5 though?  Sorry, I'm just smart enough to be dangerous with computers.
Thanks for all the help you guys.  Keep the suggestions coming.  Does it look like I need a new power supply?

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