Windows 7 Incorrect Scaling

I ran into a problem the second after installing Windows 7 a few months ago, but it only affected a few applications at the time, so I ignored it. Now an increasing number of applications behave the same way and it's annoying. The DPI settings seem to have an issue as can be seen below:

The same application should look like this:

The DPI is set to 100% (I tried changing it but it had no effect). I think perhaps the Regional / Language settings have something to do with it but I can't turn it off to English only.

Any ideas?

This is a known bug that affects users with a high resolution display.

During installation, Windows 7 installs a larger font set which is 125% of the normal size. If you then choose go back to the standard font size (100%), Windows will keep some of the large fonts even though everything else is adjusted for standard fonts, causing some programs to display incorrectly as the DPI is too big for the window size.

1. Open the Start menu and type regedit and press Enter.
2. Locate the key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
3. Find the value MS Sans Serif 8,10,12,14,18,24
4. Change from SSERIFF.FON to SSERIFE.FON
5. Find MS Serif 8,10,12,14,18,24
6. Change from SERIFF.FON to SERIFE.FON
7. Find Courier 10,12,15
8. Change from COURF.FON to COURE.FON

Restart Windows and the problem should be resolved.

Right-click on the desktop, click on Personalize > Window Color > Advanced appearance settings and change the font sizes there. Or you could just set everything to the default theme and see what happens.