The official system requirements page for Office 2010 recommends a minimum of 3 GB free space for Home and Student, Home and Business, Professional editions, and 3.5 GB for Professional Plus edition. For users who have installed Windows Vista or Windows 7 on a 20 GB or 30 GB partition, freeing up 3 GB disk space is a difficult task, as most of the space is occupied by system files and hibernation file.
What most Windows and Office 2010 users don’t know about Office 2010 is the setup lets you install Office 2010 on a different drive other than the operating system drive (by default, the setup selects Windows drive for the installation).
For instance, if your Windows Vista or Windows 7 drive is “C” and the drive doesn’t have enough free space to install Office on that drive, you can install it on D, E or any other drive. This feature comes in handy for users who don’t have sufficient free space to install Office 2010 suite.
Step 1: Run Office 2010 setup file, enter your product key and click Continue button.
Step 2: Accept the license agreement and click Continue button to see Install Now and Customize buttons. Click on the Customize button.
Step 3: Here, switch to File Location tab. Click on the Browse button to select a location than default one. Once done, click Install Now button to begin installing Office 2010 on your PC.