My PC would no longer be able to load my profile

Hi All,
I hope you can help me out.
I am having an issue loading my profile on my Windows XP computer.
Aside from the Administrator, there are two profiles in there.
One is my sister’s and the other is one is mine. My sister’s profile does not have an issue, while mine does.
I am seeing this error:
Cannot load locally stored profile
When I click on OK, I no longer see my stuff. What to do? Help.
