[dba-Tech] Strange message

Upon a restart on my Win 8.1 laptop, I'm getting this message halfway into
the startup:

Windows cannot find 'c:\program files (x86)\Search Extensions\Client.exe'.
Make sure you typed the name correctly, and then try again.

I guess that something I installed wanted to hijack my search engine, but
have no idea how to track this down, or even whether my guess is accurate.

Any suggestions how to track this down?

-- 
Arthur