Hello,
many thanks for your comment. If the computer fails completely the software license may be reinstalled under the premise that the software is under support.
Period of support is e.g. 2 years. Reinstallation is possible only during this period on a comparable windows vista environment. But if your software is out of support (after 2 years), the software may not be reinstalled any longer. Due to the fact that statistical software does not change its internal mathematical routines and procedures but only gets some minor impovements regarding graphical presentation facilities, you can use these software packages for many years.
Your question, what to do when the computer fails, is to reinvest in a new version of the software.
Nowadays most software providers sell their licenses only for a limited period of time (mostly one year) and give online access to their servers, where the software is installed, so that the described problems with older windows versions will be no major point of concern.
Best regards, Stefan