can someone help me?

i'm not new in flashing... i had a n900 before and flashed it a lot of times...
now i want the new pr1.3 on my n9 but it's not aviable for my black 16gb (malaysia)...

so i downloaded the flasher and the image for the cyan 16gb (malaysia) which should work or not?

but when i want to flash it nothing happens when the flasher is waiting for the n9 to be connected...
sometimes the n9 just boot when i connect usb and sometimes nothing happens...

i tried it on my netbook (win7 starter) and on an old laptop (winXP)
so whats wrong?