Have you tried Disk defragmentation ?
How full is the disk ? Disk I/O performance tends to drop off when over 80% full.
The other thing to do is lookup (google) the tech spec of your disk drive(s), Spindle speed, cache memory and head access times. On a budget PC the disks tend to be lower performance spec than the top end machines. This is where SCSI drives have the advantage because their more complex controller can handle multiple read/write sequences. You maybe able to replace the IDE drive with a higher spec version without too much extra expense.
A 7200 rpm drive compared to a 10,000 rpm drive is 25% slower.
Also if you do a Ctrl + Alt + Del and then click on the task manager button. You need to get screen shots of the performance and processes tabs whilst the machine is being trashed these should indicate if you are infact running short of RAM.
Some programs memory map files rather than pull a big file into physical memory but this requires a good disk sub system speed to give good performance.
It maybe this program was designed to use server based hardware rather than a desktop machine.
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