Well you have a problem with out the Dell restore disk. This is one item that will soon be needed and if the next procedure I give you does not work you are going to have to call Dell for a recovery disk.
How Do I Create a CD Containing My Operating System with the Dell™ OS Recovery Utility? http://support.dell.com/support/topics/glo...&dn=1091713
When you get the above procedure done or you get the recovery disk from Dell, (Not the other one you say you have) you can do the next procedure
Dell - Procedures for Reinstalling or Upgrading to Windows XPhttp://www.djdenham.com/Install%20Procedures.htm
The Dell software is written just for your Dell and nothing else. To do anything like this you should have the Dell Software.
I would suggest that you should backup your data and if you can not use safe mode then you should take this hard drive out and install it into another computer as a slave drive and manually backup your data using a file manager to do this.