Installing multi-language support in Windows 7 Professional and Home Premium editions
Multi-language support is native in Windows 7 Enterprise and Ultimate editions, but, following this tutorial you be able to alternate entire many languages in Professional and Home Premium editions.
First you'll need of Vistalizator. This application enable to install muti-language support in all Windows 7 editions and, how it's portable, you don't need install it. Download it clicking here.
After, download the languages for architecture x64 (64 bits) or x86 (32 bits).
Now run the Vistalizator and click in "Add languages".
Browse for language file that you desire and click in "Open".
Will be show the message below, then click in OK to proceed
A new window will be open with language data and your description, then click in "Install Language".
Wait the installation process be done.
Now, the Vistalizator will show for you the languages installed in your machine and there will be the recently installed language.
Reboot Windows and voilá. 
Now you have Windows 7 Professional/Home Premium with multi-language support.
The only bad thing that I noticed was: all time that you want to change the language, you must to use the Vistalizator, because the Windows 7 Professional and Home Premium doesn't support this feature natively.
Solving problems with removal of the external HD in Windows 7
Some times I had problems when disconnected my external HD using Windows' s Removal Device Assistant, the most frequently was "This device is currently in use. Close any programs or windows that...". This message appeared even with all programs closed.
After checked Windows settings, process and services, I noticed that the problem was in service "Windows Media Player Network Sharing Service", forcing me to stop it before remove the device.
But still, this solution not is right, then I found the most right:
The service "Windows Media Player Network Sharing Service" is responsible to share your media files (musics and videos) in your network or in the internet (like your name sounded. 
). This is default setting in Windows 7, to disable it...
Click in Start menu, type "Network and sharing center" and select the application. Like show in the image
Click "Choose homegroup and sharing options"
Clique na opção "Escolher opções de grupo doméstico e de compartilhamento"
Now click on "Choose media streaming options..."
Change option of item "Media programs on this PC and remote conections..." to "Blocked".
Finish! From now you can remove your external hard drive or other removable storage devices without problems.