Adjusting font size on windows vista

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Go to start then open the control panel you will see the personalization icon if your control panel is on classic view. Open the personalization and click on the Adjust font size (DPI)under the task by your left.

If you are prompted for an administrator password or confirmation, type the password or provide confirmation, And it should open the DPI Scaling.

From there you can choose the (120 DPI)for larger scale or click on the Custom DPI setting tab to make your own setting. You can always reset it if at all you do not like the changes.
You can also click on the "How do i know which DPI to choose?" for more info.

Restart your system to see the changes.