From the back of the case: just got the disk a few weeks back, have been testing it for awhile now from the download.
Windows xp (home,pro,mce or tablet edition with sp2)
IE6 for windows xp SP2
PC with 300 mhz or higher cpu
256 MB Ram
550 MB of avaialable hard disk space
56kbps or faster internet connection (broadband recommended)
Readabl/writable CD or DVD drive required for backup and restore functionality
* Please not DVD DL (double Layer) and DVD-RAM are not supported