1. Click the Start button and type regedit in the Search box. In the Results, Right Click regedit and select the Run as Administrator option.
Navigate to the following key:
HKEY_CURRENT_CONFIG\Software\Fonts
2. Backup the value you will be changing.
Right click the Fonts key in the left pane, select Export. In the Save As dialog, select the Desktop as the save in location. In the File Name box type LogonBackup. Click the Save button.
If anything goes wrong, you can go to the Desktop, right click the LogonBackup.reg file and select Merge to restore the registry value.
3. In the right side pane, Double Click the LogPixels value. In the Edit dialog box, change the 2 digit value using the following guide.
60 -(100% Font Size) -Default size
78 -(125% Font Size)
90 -(150% Font Size)
4. Exit the Registry editor and restart the computer to test the results.