has any other maemolites had success flashing the N900's firmware on good-old Vista??

I downloaded the Flasher3.5 tool and the latest firmware RX-51_2009SE_3.2010.02-8_PR_COMBINED_MR0_ARM.bin, put them in the same directory, booted the N900 in flash mode (by holding u and plugin in the usb) and ran the command

flasher-3.5.exe -F RX-51_2009SE_3.2010.02-8_PR_COMBINED_MR0_ARM.bin -f -r

as instructed from the various guides available!!

But sod all happened, Vista asked me if i wanted to run the program, I said yes, then the terminal flashes and goes back to the command prompt.

I also tried running the flasher program in all the available compatibility modes to no avail, Im guessing ive done a real n00bish mistake..