lockups

i just built a new system with a xp1800+amd cpu.loaded mobo drivers,via 4.36 and dx 8.0 ,21.83 video drivers everything current.my system runs fine for awhile and then locks up the screen is frozen but the mouse cursur moves around like normal.sometimes its ok for 30 min or so and sometimes just 1 min.this is my system epox 8kha with current bios xp 1800 cpu , floppy, 40gb hard drive,dvd rom ,pacific digital burner,aopen 56k modem,gforce 3 visiontek,256mb of crucial ddr,3 80mm fans,and the new audigy sound card.all runing under windows 98se.my case is an addtronics tower with a 300 w power supply.is this enough power for all this?all drivers current.gunna post before i get lockup.....please any ideas......

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