No, I have Windows 7 x64 Ultimate...
...so try uninstall/reinstall method, otherwise use this tool: Windows Phone Device Manager.
What languages support that version ? (I'm interested Polish).
...no polish language in this version, sorry. The only languages are:
Could you link a guide??
...so here is the guide:
1 - You must have this things: Windows Phone Power Tools, NAVIGON_Europe_v18.104.22.168.xap patched (you can obtain it using WP7 3Mktplace), NAVIGON Q4.2011 Maps (from Google as well) end, obviously, ...