After about 10-15 mins of use my pc will lockup - but only the first time it is turned on (ie. it works fine for the rest of the day).

adam@a1700:~$ uname -a
Linux a1700 2.6.6 #1 Fri Jun 4 17:25:59 BST 2004 i686 GNU/Linux

in /var/log/kern.log i get this:
[seems to relate to the nvidia kernel module i am using?]

Jun 6 14:00:58 a1700 kernel: Badness in pci_find_subsys at drivers/pci/search.c:167
Jun 6 14:00:58 a1700 kernel: Call Trace:
Jun 6 14:00:58 a1700 kernel: [pci_find_subsys+232/240] pci_find_subsys+0xe8/0xf0
Jun 6 14:00:58 a1700 kernel: [pci_find_device+47/64] pci_find_device+0x2f/0x40
Jun 6 14:00:58 a1700 kernel: [pci_find_slot+40/80] pci_find_slot+0x28/0x50
Jun 6 14:00:58 a1700 kernel: [pg0+546226216/1069232128] os_pci_init_handle+0x39/0x68 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+544737375/1069232128] _nv001243rm+0x1f/0x24 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+546074901/1069232128] _nv000816rm+0x2f5/0x384 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+545454380/1069232128] _nv003801rm+0xd8/0x100 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+546073679/1069232128] _nv000809rm+0x2f/0x34 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+545458000/1069232128] _nv003816rm+0xf0/0x104 [nvidia]
Jun 6 14:00:58 a1700 kernel: [pg0+545452046/1069232128] _nv003795rm+0x6ea/0xaec [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544838247/1069232128] _nv004046rm+0x3a3/0x3b0 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545893287/1069232128] _nv001476rm+0x277/0x45c [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544748442/1069232128] _nv000896rm+0x4a/0x64 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544754612/1069232128] rm_isr_bh+0xc/0x10 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+546216356/1069232128] nv_kern_isr_bh+0xf/0x13 [nvidia]
Jun 6 14:01:02 a1700 kernel: [tasklet_action+70/112] tasklet_action+0x46/0x70
Jun 6 14:01:02 a1700 kernel: [__do_softirq+125/128] __do_softirq+0x7d/0x80
Jun 6 14:01:02 a1700 kernel: [do_softirq+38/48] do_softirq+0x26/0x30
Jun 6 14:01:02 a1700 kernel: [do_IRQ+253/304] do_IRQ+0xfd/0x130
Jun 6 14:01:02 a1700 kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
Jun 6 14:01:02 a1700 kernel:
Jun 6 14:01:02 a1700 kernel: Badness in pci_find_subsys at drivers/pci/search.c:167
Jun 6 14:01:02 a1700 kernel: Call Trace:
Jun 6 14:01:02 a1700 kernel: [pci_find_subsys+232/240] pci_find_subsys+0xe8/0xf0
Jun 6 14:01:02 a1700 kernel: [pci_find_device+47/64] pci_find_device+0x2f/0x40
Jun 6 14:01:02 a1700 kernel: [pci_find_slot+40/80] pci_find_slot+0x28/0x50
Jun 6 14:01:02 a1700 kernel: [pg0+546226216/1069232128] os_pci_init_handle+0x39/0x68 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544737375/1069232128] _nv001243rm+0x1f/0x24 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545462877/1069232128] _nv003797rm+0xa9/0x128 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545907873/1069232128] _nv001490rm+0x55/0xe4 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+546074964/1069232128] _nv000816rm+0x334/0x384 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545454380/1069232128] _nv003801rm+0xd8/0x100 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+546073679/1069232128] _nv000809rm+0x2f/0x34 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545458000/1069232128] _nv003816rm+0xf0/0x104 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545452046/1069232128] _nv003795rm+0x6ea/0xaec [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544838247/1069232128] _nv004046rm+0x3a3/0x3b0 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+545893287/1069232128] _nv001476rm+0x277/0x45c [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544748442/1069232128] _nv000896rm+0x4a/0x64 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+544754612/1069232128] rm_isr_bh+0xc/0x10 [nvidia]
Jun 6 14:01:02 a1700 kernel: [pg0+546216356/1069232128] nv_kern_isr_bh+0xf/0x13 [nvidia]
Jun 6 14:01:02 a1700 kernel: [tasklet_action+70/112] tasklet_action+0x46/0x70
Jun 6 14:01:02 a1700 kernel: [__do_softirq+125/128] __do_softirq+0x7d/0x80
Jun 6 14:01:02 a1700 kernel: [do_softirq+38/48] do_softirq+0x26/0x30
Jun 6 14:01:02 a1700 kernel: [do_IRQ+253/304] do_IRQ+0xfd/0x130
Jun 6 14:01:02 a1700 kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20