Nes,
As for finding the drivers for the IDE controller I would actually looking directly on Compaq website. Over the past few months they have done a lot of work on their driver section. You can get almost any driver for every model computer they ever made. The link to the driver section is :
http://www.compaq.com/support/files/
For the processor, I really do not think you can find out what it is without taking the heatsink off. Try looking on the bottom and see if you see any serial numbers. Here is a link I found on Intel's website on how to identify a processor by the serial number
http://developer.intel.com/design/pentium/qit/
Good luck!
keefe