We now have a version of Web Designer Premium that takes advantage of the power of 64 bit on Windows 7 & 8, if your computer supports it, enabling you to create larger, more content rich sites, excellent news for anyone creating large sites with lots of high-resolution photos (typically 50 or more) where the memory limits of 32 bit Windows were becoming a problem. Note for v8 owners: the Live Effects plug-ins will not work with the 64 bit version.
Here's how to find out if your computer is 32 bit or 64 bit:
Windows 7: in the start menu right click on Computer, select Properties
Windows 8: hover over the right end of the start bar, click Settings > PC Info