To read Wichaar properly you need Alvi Nastaleeq font installed on your computer.
You can download font from link given below.
http://alvi.urdushare.net/blog/200811/download-alvi-nastaleeq/
How to install font.
1-Click above linke to download Alvi Nastaleeq Font in ZIP file and save file on you computer.
2- If you are running Windows XP Right click ZIP file and select “Extract All” from menu.
3-Once file is Un Zipped, Copy Alvi Nastaleeq.ttf file and
4- Opne "My Computer" > C drive > Windows> Fonts Folder.
5. Copy that font file in fonts directory.
6. Press F5 to refresh fonts database.
7. Now you must be able to read Wichaar Properly.