.75 that you have, is the latest Official Release from Verizon. Which is what a majority of the BlackBerry Storm users have on there phones.
When you plug your phone into the USB Cable, it should display your PIN #. Then ask for your password also, if you have none, proceed to click ok. Then, it should show your blackberry already synced to DM at the bottem you should see your PIN # and it displays device connected. If your phone wasnt connected, it would say device disconnected. Hope that helps.
Ive had my BB for about 2 weeks now and when I try to go to DM I get a blue screen and thats it. Been doing ok with out it i guess but would be nice to have. Sorry to hijack.