MS have a Cleartype Tuning Utility and with that you can not only
adjust the settings to that the appearance is better (in XP and VISTA
and with CRT as well as LCD monitors) but I think you can turn off
Cleartype altogether.
Here's what VISTA Help says:
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To tune ClearType
You can use the online tuner to further adjust the legibility of on-
screen items.
Go to the Microsoft typography website, and then follow the
instructions for tuning ClearType.
To turn on ClearType
Click to open Appearance Settings.
Click Effects.
In the Effects dialog box, select Use the following method to smooth
edges of screen fonts.
Select ClearType in the list, and then click OK.
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Those are for turning it on -- there is a check box so you can also
turn it off or you can select Cleartype or Standard for smoothing.
I find it improves even on my CRT.
Here's the link to the Tuner that you can download or you can use the
on-line version.
http://www.microsoft.com/typography/ClearTypePowerToy.mspx