Office Standard 2010
Computer and processor 500 MHz or faster processor
Memory 256 MB RAM; 512 MB recommended for graphics features and certain advanced functionality.1
Hard disk 3.0 GB available disk space
Display 1024x576 or higher resolution monitor
Windows XP (must have SP3) (32-bit), Windows 7, Windows Vista with Service Pack (SP) 1, Windows Server 2003 with SP2 and MSXML 6.0 (32-bit Office only), Windows Server 2008, or later 32- or 64-bit OS.
Graphics Graphics hardware acceleration requires a DirectX 9.0c graphics card with 64 MB or more video memory.
Additional Requirements Internet Explorer (IE) 6 or later, 32 bit browser only. IE7 or later required to receive broadcast presentations. Internet functionality requires an Internet connection.
Multi-Touch features require Windows 7 and a touch enabled device.
Certain inking features require Windows XP Tablet PC Edition or later.
Speech recognition functionality requires a close-talk microphone and audio output device.
Internet Fax not available on Windows Vista Starter, Windows Vista Home Basic, or Windows Vista Home Premium
Information Rights Management features require access to a Windows 2003 Server with SP1 or later running Windows Rights Management Services.
Certain online functionality requires a Windows LiveTM ID.
Other Product functionality and graphics may vary based on your system configuration. Some features may require additional or advanced hardware or server connectivity; www.office.com/products.
Should work if you meet the requirements !
Call Microsoft and ask why the key is coming up invalid!