In most computers the Malayalam letters should appear correct. In case you do not see all the letters correct, please download and install the fonts on your computer following the steps below.
1) Click on the links below to download the font files
2) Save the files on your computer desktop.
3) Once the downloads are complete, double click on each file one by one and click on the install button.
4) Or open the fonts folder. Usually C:\Windows\Fonts. Then copy the downloaded files there