Desktop Loads Slow

Hi everyone

I have a dell inspiron 1525 with windows vista home premium.its in good standings,almost brand new,since i have like 4 months already with it.The prblem is the following.

All of sudden when i restart my laptop it restarts fine,but when it goes to the desktop,it has a blank black screen,and it takes like 2 minutes for the desktop to load,icons to show and etc.i mean it worls fast,after everything loads,byt why does it take long to load my desktop?and what about the screen?

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