Annoying command prompt boxes when starting up

When my friend fires up her pc, she gets two screens overlaying the desktop display.
One of the screens looks like a command prompt with a heading of taskeng.exe and the other
has a heading of C:\Program Files (x86)\Search Extensions\Client.exe. and inside this screen it says -
"Windows cannot find C:\Program Files (x86)\Search Extensions\Client.exe. Make sure you typed the name correctly, then try again."
Comes up every time the pc is booted up and although they are easily removed, it's really annoying.
How can this be fixed?
Pretty well okay with the msconfig start up programs, but how do we equate those with what
is shown in these boxes?
Thanks