Vista - Test Mode in all 4 corners-Weird Problem

Hi Folks, I've been trying to download a free CPU temps monitor this afternoon without success and now I seem to have been left with something unwanted on my desk top.
When I'm just looking at the wallpaper and bottom bar ie I've just booted up, I've got the words Test Mode written in all 4 corners of the screen plus Microsoft(R)Windows(R)(Build 6001;Service Pack 1) written at the top middle.
This must have been left over from one of the temp monitors I tried and then uninstalled.
First I tried Real Temp 2.70 and that installed but then I realised I had to pay for it so I uninstalled with Revo Uninstaller. I then tried Speed Fan and Motherboard Monitor but these didn't like Kaspersky and looked like more trouble than they were worth so I uninstalled them as well.
Now I'm stuck with these words on my screen. They are quite small but still intrusive.
I think Real Temp is the culprit. Does anyone have an idea how to get rid of this problem?
Thanks, John

Hi John,

Have you tried using 'System Restore' to restore your system to a point prior to you having this problem?

Hi Dwarf, yeh I just did system restore twice at two most recent points, both early hours of this morning, and the problem is still there. v.peculiar. J

I'm going to try again a bit earlier. Maybe Friday. See what happens. Cheers, John

Test mode normally shows when driver signing has been disabled.

Have you installed anything that recently that could have done this?

Hi z3. Yes I think you are right. I've just restored to 3 days ago and it's still there. Thinking about it Real Temp asked to disable driver signing. How do I switch it on again?
Thanks, John

Take a look at this thread:- How to turn OFF "Test Mode" in Vista x64 Ultimate

Excellent. Didn't think it had worked at first but just needed a reboot. Thanks very much, that would have really begun to annoy me even though it was only small.
Think I'll give up on temp monitors fot now, cheers, John