Bluescreen problem when booting

I've got a Fujistu-Siemens laptop that I just re-installed WinXP home edition on with sp2.

In the last three days I've received lots of different bluescreens when I boot up the laptop.
- Stop 0x0000007E
- Stop 0x000000BE Netbt.sys - address B2F1FFA5
- Stop 0xC000008E Ipnat.sy - address B2F31FA3
- Driver_irql_not_less_or_equal Sisnic.sys - address 0x000000D1
- Process1_initalization_failed - address 0x0000006B

After receiving a bluescreen at reboot I select the last good profile in the boot menu and then window loads up ok.

When winxp has loaded up properly and I do a restart then there is no problem with bluescreen, it only appears to happen when doing a cold boot.

I've using the latest driver from the Fujistu-Siemens website. Have also run a memory-diagnostic program download of microsoft's website.

I've already done two re-installs of winxp in 2005...

Any ideas ?