I can't see anyone being able to answer this, because there is so much information missing to even understand what the question is asking about.
Go through exactly what you are trying to do, step-by-step, and make sure you include all important details: what operating system are you using? What type of rescue disk (CD/DVD or USB drive)? What are the specifications of the computer? Is it a desktop or laptop? Was the rescue disk supplied by the PC vendor or did you make it yourself? What problems were you experiencing before you tried to use the rescue disk?