Some system fonts have evidently been damaged after installing and uninstalling many applications. Windows has been displaying messages incorrectly for some time. Tidy up your system again by reinstalling the necessary fonts and deleting fonts that are unnecessary.
Renewing Fonts:
The following fonts are included in Windows and these should remain installed on each and every computer: ‘Courier New’, ‘Arial’ and ‘Times New Roman’ (TrueType in each case including the variations ‘Bold’, ‘Italic’ and ‘Bold italics’) as well as ‘Symbol’ and ‘Wingdings’ as TrueType, and ‘MS Serif’ and ‘MS Sans Serif’ as normal types. The system fonts can be renewed quickly: simply start the Windows setup,it
replaces the missing or system files that are changed automatically.
Adding Fonts:
Under Windows 2000, XP and Server 2003, you can add or delete fonts only as administrator. In order to
reinstall a missing font from a removable disk,
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Open “Start > Run” and type %windir%\fonts.
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After typing in the above command, click on ‘OK’.
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Now open ‘File > Install New Font’ and under ‘Drives’, select the removable disk with the desired fonts.
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Open the relevant folder and click on the font you want to add. For selecting several fonts simultaneously, keep the [Ctrl] key pressed while clicking on the icons.
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Now activate the ‘Copy fonts in the font folder’ checkbox and click on the ‘OK’ button.
Deleting Fonts:
In order to delete fonts entirely from the hard disk, open the font folder as described above. Select the fonts you want to delete and click on ‘File Delete’. Answer the security question ‘Are you sure you want to delete these fonts’ by clicking the ‘Yes’ button.
If you only want to prevent a font from getting loaded while starting your computer the next time, just move the font from ‘Fonts’ to a different folder. You can even use this method for error handling when it is not possible to delete the font or its registration information.
Also check How to make your own Fonts with your Handwriting