There is a way to fix the factory fonts in Windows 7 without repairing/reinstalling the OS.
First insert your Window 7 Disk.
Navigate to (CD ROM Drive Letter):\sources
You should see a file labeled install.wim. This is what contains the original Windows 7 installation image. It also contains the font files.
Before mounting the image file we need a place to mount it. Create a folder at the root of C: called 'win7wim'. The path should be C:\win7wim.
Go to the Windows button and select Run...
Type in CMD (make sure it is running as Administrator).
In CMD, type:
dism /mount-wim /readonly /wimfile:(cdrom drive letter):\sources\install.wim /index:1 /mountDir:c:\win7wim
Once it is finished mounting navigate to...