I've been trying to re-install a stack of MS SQL Server installations, from 2005 to 2012, with no luck. "Uninstall" of MS SQL Server 2008 kept failing because "the following products are installed:"

Microsoft SQL Server 2008 R2 RsFx Driver
Of course the RsFx (Report Streaming?) driver showed up nowhere in the list of installed programs. This post solved my problem: SQL 2008 R2 – Uninstall of SQL fails with error about RsFx Driver or Common Files still being installed:
"Option B – Get the product GUID (Identifying number) from WMI using WMIC and uninstall using MSIEXEC /X {GUID} "
I had trouble reading the text describing the actual shell commands to use, because it rendered white-on-white in my browsers (Safari, Google Chrome). Happily it was easy enough to just select the region with the mouse and paste into a plaintext text editor buffer :)