Can I install both Dopus 64-bit and 32-bit?

Apparently neither quickview nor x1 "support" 64-bit os's, resulting in dopus's multiview being unable to use them to view other file types (i.e., wordperfect). So, can I install both 32-bit and 64-bit dopus (on a windows 7 64-bit machine), and use quickview or x1 with the 32-bit version to view wordperfect files, but use the 64-bit version to avoid the virtualized file system problems??

No, you can only install 64-bit Opus if you're using 64-bit Windows.