installing both xp and slackware
 

I was using slackware, because of the startx problem, I deleted it and
installed XP. Now again I want to install Slackware and configure X.
But I don't want to delete XP.

Can anybody guide me to install Slackware so that I'll be able to boot
both Slackware and XP.

There are various ways you could go about this, but here is one:

http://www.linux.com/feature/113945

Use a gparted live cd to downsize your windows partition(s) and create Linux partitions in the freed space, then install Slackware.

Briefly:
disable the page file on XP
reboot
defragment
resize XP partition using GParted or QtParted on a live CD. Leave free space unallocated
re-enable page file on XP
use cfdisk during Slackware installation to create new partitions.

errorsunknownp, try to take a look here:
http://www.linuxquestions.org/questi...ckware-293941/

Maybe it can help.