As a third-party tool, it can potentially cause system instability or issues. Steps to Use Vistalizator
Note that using Vistalizator to install restricted language packs may break the Windows End User License Agreement (EULA).
If you experience a "black screen of death" (KSOD) after using it, try using the "Last known good configuration" in the boot menu (F8).
Works on both 32-bit and 64-bit Windows Vista and Windows 7. Method: Utilizes official MUI packages from Microsoft.