MUI on Windows 7 Professional

MUI can be also installed on Professional edition avaliable at MSDNAA:

Run CMD as administrator and type:
DISM /Online /Add-Package /PackagePath:(path to lp)

then:
bcdedit /set {current} locale (your locale)

and:
bcdboot %WinDir% /l (your locale)

Then in registry:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlMUIUILanguages
remove key en-US

Reboot and it's done

Can also be done otherwise:
http://blog.freakz1.de/?p=310

Vistalizator site:
http://www.froggie.sk/index.html

Language packs download:
http://www.froggie.sk/download.html

More info on DISM at
http://technet.microsoft.com/en-us/library/dd744311%28WS.10%29.aspx