The first thing you could try:
You could get lucky if......you turn on the laptop, and immediately put the Recovery Disc that came with the laptop in to the CD/DVD/RW drive. When it starts to boot up, the computer could see the disc and start some recovery program (this would be good if you need to not lose any files).
If you do not have a recovery disc for your model laptop, you might be able to find one at Dell support (link for your model is below), or you might be able to find one on eBay.
If that does not work, you could immediately put a legal Windows XP install disc in the CD/DVD/RW drive. When it starts to boot up, the computer might see the disc and start to set up. If it does, it will format, partition, and install (but you would lose all of your current files).
If that does not work, I searched for you and found the official Dell Inspiron 1300 support link. Get it here:
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid=&SystemID=INSPIRON1300/B130
Here they will have manuals, driver installs, software installs, utilities, etc. You might need some of these files even if you have a successful recovery. You probably will need some of them if you do a clean XP install (because Windows might not have all of the drivers for your sound card, video card, modem, etc.).
Good luck. :-)