Enginner'sToolset Uninstallation woes

Hello group,

I downloaded the trial version, and tested it for a while.
Decided it was not for me, so I uninstalled it.

After a couple of days, I got problems while attempting to install another SW package.
Some messages indicated it was related to Engineer's Toolset. So, I reinstalled Engineer's Toolset, and the install of the new package went ok.
Uninstalled Engineer's Toolset again.

However, the same story repeated itself several times. Lots of bits & pieces are left over after uninstalling Engineer's Toolset. Did a search on my disk and found plenty.
So, how can I remove it fully and avoiding such problems?

I have asked Solarwinds support, but they refused to help.
Said it was my problem, since I should have installed it on a test machine.

Kind regards,

Per-Tore