my desktop icons are not appearing immediately

When i switch on the system(WINXP-SP3), after the Welcome screen i am getting background screen but my icons are not appearing immediately. i am getting the icons only after 2-3 minutes until than i am getting only the
background screen. usually i use to get all the icons and the windows scrren imeedaitely but it suddenly taking ages. why is it so?

Anyone can please help me

Note: Just 5 days ago I formatted and reinstall from scratch then also...

Thanks

Do the icons and task bar (start menu) appear at the same time? Or do you see the taskbar and everything seems to be loaded but the icons take much longer and appear after everything else?

This may have something to do with Active Desktop - settings around found in the display properties under the 'desktop' tab.