Sorry for the tone of my previous response...
It can be hard to remove all traces of a SQL install, that is why I was suggesting a scratchpad machine if you want to try out SQL installs. Also, not all editions will install on Win 7, you need a server edition of Windows to install SQL Enterprise and BI editions. However, you can get all the features of Enterprise by installing Developer edition.
Your approach of taking a system image is probably the best one for rolling back a SQL install. It will guarantee there are no odd files, registry entries, permissions or accounts left in your system, and should give you a clean base to try another install.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara