Unless you absolutely need the MS Office suite, you should consider a Linux distro like unbuntu 12.10. As other Freepers have suggested, it installs from a USB drive with at least 2GB of storage - more is better. I am using this distro to write this and your PC will have much higher performance.
While the entire MS Office suite is not a deal breaker for me part of it is. Almost everything can be done and sometimes done better in OpenOffice. Its the Almost that keeps me in Windoz land.
I use Access with a ton of various VB applications which need a reasonable size database with only a single connection and OpenOffice Base will not play nice with VB. A complete rewriting of my VB stuff and Access to OO Base ranks right up there with a root canal without anesthetic.