I'm upgrading my graphics card I have no display adapter in my device manager

I have attempted to update my Nvidia P73 graphics card with a 8400GS
but when I went to disable my current display adapters, I had no
display adapter button in my device manager, though I did have a Vide
Controller under other devices. If I plug in the new PCI-based vide
card, I have no screen after the dell BIOS (doesn't seem to be bootin
windows), but if I plug in the old card, it'll boot windows.
I know very, very little about computers.
I've tried to update my chipset, but this doesn't give me displa
adapters back. Maybe I'm not updating properly?

Dell 4550
Pentium 4
640 RA

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tony50
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