I found an old QV9 SR2 pdf which has the following info:
Microsoft .NET 3.5
IE7 / Firefox 3
Microsoft® Windows Server 2003 ™ including x64 Edition
• Microsoft® Windows Server 2008 ™ including x64 Edition
• Microsoft® Windows XP™ including x64 Edition*
• Microsoft® Windows Vista™ including x64 Edition*
• Microsoft® Windows 7 including x64 Edition*
*Recommended for development and testing purposes only.
But as the other posts say V9 is not supported, or XP or Vista, and you really need to move to a more recent version as this will give a much richer experience for your users.