OK I contacted my guy at Omron USA tech support, he over-nighted me the new ver 4.1 on a DVD. According to Omron, it aas to be installed on Win 7 Pro or higher. So while I was contemplating upgrading my Home Premium to Pro, I said " What the heck, I'll try it anyway". Dropped the disk in and away it went, completely installed all of CX-One and 64bit drivers. After install I checked on several PLC's and NS units. Programmer, Designer, and Integrator all worked OK, CJ1's, CJ2's, C200's, & NSJ's, NS's. Now happy, I installed on 5 new 64bit laptops and all work as they should. Now if I could get the Device net for Safety Controllers in a 64bit version. I talked to Omron/STI rep last week, he has informed me that it is in progress, but no release date set yet. Just a little inconveinence having to use a 32bit laptop when working on the NE1A's.