Windows XP: c0000218 {Registry File Failure}

c0000218 {Registry File Failure}

I'm having this problem with my hp laptop. I did not add any new memory to my systeme. however, I did remove my current memory to access the inside of my laptop. The fan wire had come loose so I reconnected. I fixed that problem only to find out the problem with the registry. I have chose the load last known configuration that worked correctly but it still gives me the little blue pop up screen with the error, then the restart. I tried to use my windows xp os disk to try and repair it but it wont read the disc before the blue screen comes back up. I'm thinking of buying a Laptop To IDE Hard Drive Adapter. So, I could at least format my hard drive. I'm not sure if this would be a good idea. I went to the microsoft webpage that deals with this issue but I can not seem to find one to fix my problem. I'm looking for any help to either alleivate the problem or help steer me in the right direction.