You can just download the patcher
here and repatch the whole thing. Also cancel the patcher before it goes too far along and hit advanced and only select the expansions you need, to save some time.
Or if you have the hard drive space, try copying all the CDs to your hard drive first and then installing it from there, but you'll likely have trouble copying the CDs.
And you should have alot of it installed already. Do a search for everquest.exe on your hard drive to find where it is for sure. You may not be looking in the right directory. If there is no everquest.exe, search for *.s3d and/or *.eqg, and download the patcher to that directory and run it.
Yther Ore.