If you have downloaded some fonts from Internet or anywhere else, you can install them in your Windows by using following method:
1. Type fonts in RUN dialog box and press Enter.
2. It'll open Fonts folder. Click on "File -> Install New Font..." option, browse to the folder containing font files and click on Install button. It'll install new fonts.

But sometimes people face strange problem. They cannot find the "Install New Font..." option in "File" Menu. If you are also facing this problem, then use following method to fix the problem:
1. Open Command Prompt and provide following commands:
CD\Windows
Attrib +s +r fonts
2. Restart your Windows and now your problem should be fixed.
3. If it doesnt work, then extract the "fontext.dll" file from Windows Setup CD and copy it to "%windir%\System32" and "%windir%\System32\DLLcache" folders.
NOTE: To know how to extract a file from Windows Setup, please go through following link:
How to Include Your Edited System Files in Windows Setup?
This article was posted by VG in following section: Troubleshooting, Windows Vista, Windows XP.
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Joshy
I installed your theme but the vista buttons , toolbars, FONTS don't work.
The font is like very ugly and i can't ge tit to change to Sogeo UI i tried
1. properties and advances, icon Sogeu UI [didn't work]
2. install STyler but it just crashes when i open.
Help!?
sandy
thanks so much.
Andrews
Thanks men.
It works.
I have registered that fontext.dll file with Active X Manager coz it was there in the location but
option for install new is not coming in the menu. It is registered with Active X Manager and not it
is coming.
thanks once again.
kadishmal
This solution didn't work. However, I found another solution which worked perfectly without any system modifications.
Just right click your font file (e.g. MyFont.otf), and select "Install" menu. That will do its job. Hope it helps.