TheSkyX and TheSky6 Pro both operate under Windows 7 32- and 64-bit Editions. Here's the link to the thread about the Night Vision Mode "caveat": http://www.bisque.com/sc/forums/p/8950/32240.aspx#32240 The next update of TheSkyX (no release date right now) addresses this issue.
TheSky6 will run under Windows 7. Entering Night Vision Mode on Windows 7 will fail. See the threads below details. The workaround is to manually open the TheSky6 Night Vision Mode theme using the Windows 7 Control Panel (Start > Control Panel > Appearance and Personalization > Change the Theme...