go into device manager and disable the via sata card. then go to wow64 folder and rename the viavmraid.sys to viavmraid.bak.
then re-enable the via card it will have an exclamation mark next to it. that is what you want.
then reboot the pc. after post screen keep tapping F8 that will take you to the advanced boot menu. you then need to disable driver signing (portio isnt signed and will not boot in anything above windows vista without disableing driver signing)
then follow the jungle flasher guide for flashing the benq..if you only use the via card for flashing then leave the drivers off..if not disable / rename viavmraid.bak back to viavmraid.sys / re-enable / reboot
one other thing is that the via disabling of drivers is for the freezing during lite-on erasing. doing a benq with the drivers installed and enabled should have no ill side effects when doing a benq.
just remeber whichever method you use you will need to disable driver signing in F8 for jungle flasher to work properly with windows 7