you can always re-enable system restore, install the drivers and if all is ok disable system restore.
I had no probs installing version 1.18 on my sager. It is on RMA for the ultra so I couldn't test the 1.19 drivers for you.
Sager 9860-S
P4 650 3.4
1 GIG DDR
256MB Geforce G0 6800 DDR3
2 80GIG SATA
DVD-R + CDR
DVD-ROM + CDR
Wireless Bluetooth & Wireless lan
TV Tuner
WinXP Pro SP2
NVIDIA 76.10 Drivers
Stock Lan, Wireless Lan, Bluetooth, TV TUNER, Chipset, etc. Drivers