Problems getting in to my system

Hi it's me again . i got the new PSU today hooked it up and the system fired right up, then it got to the point of asking me for my password to login and no matter what I wrote it didn't accept it. So I stuck in my XP pro disk and did aquick format of both the drives but when it go to the point of verifying dmpi information(i think its dmpi could be something else) it just sat there over and over again. so now I'm doing a long format of only drive C and I'm hoping it will b\eventually bring me to the login screen where I can start all oiver and create a new password. If not then I have no clue what to do.

So if this does not work I'll be back. If someone here could point out what I did wrong when trying to login I'd appreciate it. I do have a disc for the new motherboard but of course the system won;t take that until I get the OS installed.

As usual I'm stuck. To be 100% honest I probably shouldn't have attempted this fix. I used to be able to do this stuff without thinking about it, but now my disability is screwing with my mind and I cannot remember how to do technical things that I used to be able to do without thought. It sucks but thats the way it is I guess .

http://support.microsoft.com/kb/321305