I'll probably take a look at it later because it's 11:44 pm over here. But I'll take a look at the BIOS to see if I can understand the layout. But if not I can call Dell to see what they think or call my sister's boyfriend whos deep into computers and see what he thinks.
It might be possible to make Windows Vista control most of this. So the following may help:
Open up the control panel.
Select "Power Options"
Click on "High Performance"
Click on "change plan settings".
Make sure "Never" put computer to sleep is selected.
Click on "Change advanced power settings".
Never turn off hard disks.
Never sleep.
Disable USB selective suspend setting.
Turn off PCI Express link state power management.
Set the processor power management minimum state to 100%.
Set the processor power management maximum state to 100%.
Set search and indexing to power saver mode.
Dream Scene settings = High performance (although I've completely disabled dream scene on my computer. Let's not go there just yet.)
Multimedia settings: prevent idling to sleep.
See if this helps you to record without dropouts occurring.