If you already have a dedicated video hardware card, then please ignore my advice on that
Your computer has two IDE channels. Each can take a primary drive and a slave drive, configured via jumpers on the drive itself.
The primary and slave together share a single IDE channel. If one disk is slower than the other, then both disks will run at the speed of the slowest one - which is why it is worth having faster drives on a separate channel to slower ones.
This can be a fairly tricky process - and was only suggested as a performance enhancer.
The steps are;
1. Open up the case, and locate the two identically sized IDE slots. If both are occupied, then I would suspect that the second channel has your CD device on it. This raises a slight dilemma, since CD-ROMs are slower than Hard Disks. If the second disk is only for storage, this may not be an issue, if the performance gain on the main hard disk is worthwhile to you.
2. Connect the 8Gb drive to the second IDE cable, if you wish to proceed. You may wish to make the disk the primary, in which case it should be at the end of the IDE cable, and the CD device should be connected to the middle connector. If there isn't one, switch this cable with the one that was connecting the two hard disks. Change the jumper on the hard disk so that it is in the master position, and the jumper on the CD so that it is in the slave position.
3. Boot the machine, and check that the disks are functioning correctly and/or plugged in correctly by using the BIOSes auto-detect feature. Virtually all BIOSes since about 1995 have this.
4. Post back at Tek-Tips if you have any problems with the above procedure
An AMD Athlon processor @ 1Ghz is very cheap and will give superb performance. Unfortunately, it will not go into the same board as an Intel processor, so you would have to buy a new motherboard.
As for identifying your existing motherboard, simply open up the case and look for the manufacturer's name and a code, usually in fairly large white numbers and letters, eg BX6, VT6X4, KG7-R, etc. The more information you can give, the easier it will be to track it down.
Since all motherboards are not equal, this information is necessary to determine which is the best processor for your board.
A quick tip; When opening up your case, make sure that you do not touch any of the components, unless you are sure that your environment is as static-free as possible, and you are wearing an anti-static wrist band connected to earth.
I hope this helps