bez nové instalace je potřeba "Windows 7 MUI Language Pack"
https://www.raymond.cc/blog/download-and-install-windows-vista-mui-language-packs-on-vista-home-basic-home-premium-and-business/
https://blog.itgs-solutions.ch/windows-7-sp1-language-packs-direct-download-links/
https://www.softwareok.com/?seite=faq-Windows-7&faq=116
na virustotal jsem to nekontroloval.