* Sigh *

Dude. It's not that bloody complicated, but at least 2 ingredients are needed here if you want to cook:

1. Effort
2. The use of your brains.

Let's start with 1.

If you don't understand the process of flashing, why don't you educate yourself, use number 2. and start using google, reading the wiki, etc.

Your questions have been answered only a thousand times, max.

http://wiki.maemo.org/Updating_the_firmware

The use of 64bit Windows has been discussed all over the place as well.
It can easily be avoided by using a linux flavored LiveCD.

Read up here.

https://help.ubuntu.com/community/LiveCD