Except that given your pc has none of the proper motherboard drivers installed it's probably that which is causing it to crawl.
The pagefile size will default either to system managed or 150% the size of RAM when a fresh install is carried out.
How much RAM is installed in the PC ? 512MB would be the minimum to run XP with SP2 at a reasonable speed.
Problem with checking the system task manager is that the default columns don't indicate whether something is hogging the harddrive. Select processes, click view->select columns and add I/O Writes and I/O Reads. If the harddrive is being hogged by one process then it amy appear that nothing is happening when processes are competing for disk access.
I'd try something like
http://www.driverguidetoolkit.com/ and see if it lists any drivers you need as I still rate that as the most likely source of your problem.
Nice to see folks are sticking to the usual tendency of repeating suggestions already made.