Hi, If you cannot log on,
you could try safe mode. There you could select safe mode. In safe mode, you could easily use system restore in the accessories , system tool menu to get system restore. You could select the resote point created prior to repair and restsore the same. If it is not working,, then
There you could select command prompt and networking. IN the command prompt, just type restrui.exe and press enter.
Then if it shows the previous restore points, try the restore points prior to this repair.
If it resolves, then well and good.
But normally , the windows repair tool never touch those things as pw and admin pw.