Please Help.

I've been trying to update my N900 for ages. I downloaded Nokia PC Suite and it told me it can't update on that software and to download Ovi Suite. So i download that, plug my software in, click update, and after what feels literally feels like 5 whole minutes for Ovi Suite to actually find the update, I click the Next step and this appears:

http://img3.imageshack.us/img3/6640/wtfozg.png

But I do have a Sim card already inside my phone! So i uninstalled the Ovi Suite and tried again and the same message appears. Why is this happening?

is there another way to update my phone?

I have a Windows 7 64-bit PC if that may be causing problems?