Sounds like your Boot.ini file is corrupt on the o/s, you need to copy this file from your xp disc then to floppy and the reinstall it into the o/s.
OR get the recovery console which is on the xp dics and boot from that and in that way you will be able to repair the damaged files.
Insert windows xp cd, click start,run and type
D:\386\winnt32.exe/cmdcons, where D is the letter of your cdrom drive and then follow on screen instructions......Good luck bretsky;0)
bretsky using win xp home ed sp1 1gb sdram p4 cpu @ 1.8GHz 2xHDD 180GBb total. Nvidia graphics etc etc....