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You may have installed many new fonts and made changes that may cause some of your software to malfunction ! In such a scenario, it may be wise to reset fonts to the default settings of Windows 10/8/7.
Restore default font settings in Windows
Restore default fonts in Windows 10, Windows 8 or Windows 7, open Control Panel > Appearance and customization > Fonts > Font settings > Font settings.
Click here on Restore default settings.
If you need to repair the font registration, you can try FontReg. This utility can be used to ensure the consistency of the Windows font registry. This is done by registering fonts that are not properly registered and deleting expired records for fonts that are no longer present on the system.
See this article if you have a problem with fuzzy fonts in Windows and this if web fonts appear fuzzy in Internet Explorer.
TIP: With Windows 10, you can block unreliable fonts to protect your network.