Mac not always managing to boot completely

Hi
I have had a read around these boards and found several problems like this, but i have know idea what causes it (or how to fix it).
I have a Mac Mini, 1.8Gz Intel Core Duo, 1GB memory computer. I use an Airport connection for the internet and use a wired keyboard and apple wireless mouse and a DVI 19" display.
A day or two ago i turned on my Mac Mini and a problem happened. The first thing i noticed was that the "starting Mac OS X" bar progressed quicker than normal and after a second my desktop began to load. The top bar appeared and so did the dock. In the top right i noticed that the only icon that was there was the spotlight search, no volume or Airport icons. Clicking anything will result in the loading wheel and a crash.
I then try to resart it by taking is power and resarting, the same thing happens again, sometimes the dock doesnt even manage to load.
I try this about 4-5 times and then it eventually loads properly, and works as normal.
But the next time i load the same thing happens.
So theres the problem, from other topics maybe this problem is somehow related to airport - but after several loads and finaly a full boot airport works fine.
Any help would be appreciatated!

Hi Maztec-
Greetings and welcome to the Apple Boards.
Boot from the install DVD that came with your system and run Disk Utility. Select the option to repair permissions first and then repair the disk.
Luck-
-DaddyPaycheck

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