Right... So you have the sources on the Compaq box, and you need to install to the Compaq box yeah?
If this is the case then you will need to start off by creating two disks - I root disk and a boot disk. Have a look in the rootdsk and bootdsk.144 folders (I assume you have these). You use rawrite to create the disk, some something like
rawrite bare.i a: (for the boot disk, assuming IDE HDD)
rawrite color.gz a: (for the root disk)
You can then boot from the two disks, once you are booted try mounting your Windows partition that holds the sources (assuming its the first partition on the first hard disk) with something like
mount -t vfat /dev/hda1 /cdrom
(the cdrom folder will already exist, so I'm being lazy and using it). If this works then you should be able to run
and when it asks where to install from choose something like
(clearly dependent on where you saved the sources].
Before you run setup you'll probably wanna use fdisk to partition your second hard disk. As a minimum you can get away with two partitions. A swap partition (if you need it) and a root partition - you wouldn't wanna take this approach on a 'real' system but if its a learning experience then it'll be fine.
You're other alternative is to download the ISOs or get a cheap copy of Slackware 7.1 from somewhere. If you do end up buying it then its worth waiting until the newer version is out, which should be soon...