Seems that you have things mostly figured out, but here is a link to a list of Microsoft PowerToys for Windows XP. There is a "Clear Type Tuner" available that might help you.
//www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx
If you already have adjustable settings for clear type, then check out the other programs they have. I use the Alt-Tab Replacement, Tweak UI, and Power Calculator, and they're all great. |