Установить откуда не имея инсталляционного диска?
Что-то не нашел... ни на мелкософте ни так

http://www.microsoft.com/web/platform/server.aspx

View System Requirements and File Details

File Name:  wpilauncher.exe  

Version:  4.0  

Date Published:  8/7/2012  

Languages:  English, German, Japanese, French, Spanish, Italian, Korean, Chinese Traditional, Chinese Simplified, Czech, Polish, Portuguese-Brazil, Russian, Turkish  

Download Size:  101 KB  

Support Operating Systems: Windows 8, Windows 7, Windows Vista SP2, Windows XP SP3+, Windows Server 2003 SP2+, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012.  

An Internet Connection is required  
You must have administrator privileges on your computer to run the Web Platform Installer.

Спасибо, вроде нашелся дистрибутив