Hmm - I did not come on the forum, in my ignorance, since I was running SAS on Vista 32bit, I just went ahead and installed it under Win 7 RC 64 bit and encountered no problems with the install. I actually have it on three machines. This was version 4.26.1004. The first problem I encountered was when I was notified of a new version and clicked on the link. I then got an error message stating that I had to have administrator privileges, which was funny as I had only one account set up and it was with administrator privileges.
I just downloaded the full package, saved it on my NAS, uninstalled my current package (1004) and then installed 4.26.1006. I have the same problem with 4.27.1000. I will use the same workaround and see how it goes in the morning.