Need help upgrading video on Gateway

[oldgtwayman]

I have a Gateway GT 5220 that has an NVidia 6150 LE integrated graphics. I purchased an ASUS EAH 4350 512mb silent PCI-e card to upgrade. I deactivated the onboard graphics through windows, changed the video setting in bios to PCI-e first. I then installed the card, booted up, installed the newest Catalyst drivers (from the ATI site) and everything was great. After restarting the computer a couple of times, the video reverted back to the onboard graphics. I restored the system, repeated, followed all of the advice I could find and still having the same issue. Gateway tech support unfortunately was no help. I found others with this issue on the web but nothing I have read works. Anyone out there have a solution? Here is my set up:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.080814-1236)
Language: English (Regional Setting: English)
System Manufacturer: Gateway
System Model: AWRDACPI
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+, MMX, 3DNow (2 CPUs), ~2.0GHz
Memory: 2944MB RAM
Page File: 694MB used, 4134MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)

Any help would be appreciated as I really want to upgrade this video. Thanks.

 

[Hefemeister]

So basically it seems like your bios is resetting to default periodically. Your cmos battery could be running low causing it to reset.

 

[oldgtwayman]

I hadn't thought about that. I have had the pc for about 2 years so I guess it could be almost dead. I'll try to replace and see if that helps. Thanks for the suggestion.

 

[oldgtwayman]

Bio is actually not resetting. Must be other issue. Called someone today who suggested that it may be a Windows XP Service pack 3 issue. Anyone out there familiar with this??