The flasher didn't work when I tried it on my Win 7 64bit system, so I started an XP virtual machine in VMware and that worked. You can also try using XP Mode from Microsoft instead of VMware (http://www.microsoft.com/windows/vir.../download.aspx)

You have to download the flasher from here:
http://tablets-dev.nokia.com/maemo-d....5_2.5.2.2.exe

And the firmware from here:
http://tablets-dev.nokia.com/nokia_N900.php
(I used RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin)

Here are the instructions for flashing from the command line:


* Open the Command Prompt by going to Start then Run (or Windows Logo key + R) and type cmd then press Enter.
* Change directory to the flasher's program path (TIP: Use the TAB key to auto-complete the commands and file-names)

* Run the following command:


* Connect the USB cable while hold 'u' key on the N900 (details on the wiki)

* Use the interface in VMware to transfer the newly connected USB device to the virtual machine

* The update will take about 3 minutes after which the N900 will reboot and display the Welcome screen with Regional settings.


If that doesn't completely solve your problem then you might want to clear the whole internal memory of the device, but that will mean losing all your contacts, settings and files, so it will be just like a new device bought from the store. Instructions for that are here:
http://wiki.maemo.org/Updating_the_t...MC_in_the_N900