Certain applications render images brighter than they should be on one monitor

[Lexic]

This is quite clearly a software issue rather than me perceiving the images as brighter.
Here's a screenshot of an image in Windows Photo Viewer that spans the gap between the two (different makes) monitors:
[img]http://lexi.org.uk/files/art/magical_colours.png[/img]
Here's that taken to a ridiculous extreme:
[img]http://lexi.org.uk/files/art/magical_colours8.png[/img]
What reminded me (I made those pics a while ago but forgot to do anything about it)
[img]http://lexi.org.uk/files/screenshots/shing_dat_yellow.png[/img]
How the hell do I get true colour back?

[Murk]

Open up color management (if search doesn't find it, go to screen resolution windows, click additional and then colors tab) and make sure the monitor profiles match.

[Lexic]

[img]http://lexi.org.uk/files/screenshots/not_even_close.png[/img]
I've never been in here before but it looks like the Dell's getting a bit uppity. How do I put it in it's place?

[Lexic]

Aha, finally(hurf) worked out how to turn the calibration off.
I had to turn it off for all users.