Since it is an older PC, how much over the minimums for W2K are you?
Minimum system requirements for Windows? 2000
CPU 133 MHz or higher Pentium-compatible CPU
Memory 64 megabytes (MB) of RAM minimum
Hard Disk 2GB hard disk with a minimum of 650MB of free space.
Personally, I would not attempt an OS install on a system that is not at least 2X the minimums.
At a bare minimum, install all the RAM you can.
It would not hurt to check the W2K HCL to make sure that all system components are supported.
Older video cards are often a problem.
What version of Windows were you upgrading from?
If W95 or W98, I suspect that you have remnant files or registry calls from incompatable drivers.
If you can get back to the old OS, remove ALL hardware from device manager, re-boot, and cancel all hardware installs.
Then run the W2K install.
If you cannot get back to the old OS, then, install the drive in another PC and backup any needed files.
Format the drive, and install W2Kon a clean drive.
Chas