Profile takes a long time to load

Hi all,
Windows XP Pro, 256MB RAM
Build 2600.xpsp2.030422-1633(sp1).
The issue is, after the CTRL+ALT+DEL screen, when I type my username and password, my profile used to load very fast.
But I was trying to change the security settings/access rights for my C: drive the other day.
After this, my profile takes atleast 6 minutes to load. While loading, I get a blank screen.

I have since restored back to the default security setting as asked to do by Microsoft knowledge base.
When I restart my desktop, it is still the same problem.
But when I log off and login again, the loading of the profile is very fast.
Any help is most appreciated.