Downloaded the Evaluation Version of Windows x64 over the weekend and have been updating all the drivers and software. I will preface this with the simple fact I am NOT a programmer, technical guru...whatever. I enjoy technology and pushing it to the max. Install - Once I had downloaded the drivers needed from various sites (Video, sound, etc), and received the e-mail with a Product Key...things went fine. I did have to switch the SATA settings in the BIOS to get the HDD's setup correctly (Combination is the current setting, both HDD's connected to SATA 0 and 2 respectively). The install went no differently than did any other version of Windows. The download was an ISO file, and burned it onto a CD. Setup - drivers and software install went with ease, save for a few applications. Those that gave error messages were very simple - "This program will not run on your version of Windows." Outside of setting up Admin rights, passwords and re-installing all the software...things went with ease. I am missing drivers for the Printers (A Canon Inkjet and a Sony Thermal Printer) and my Scanner (also a Canon). No word from either vendor as to when x64 drivers will be avail. Use - this is a seamless transition. There is a choice for Internet Explores, one x32 and one x64. The x64 version seems to run a tad faster than the 32-bit brother. Games (BF2 and HL2) both load noticeably quicker, and there have been no software conflicts as yet. Photoshop I have not had a chance to really use yet, save for some basic editing. It didn't seem to perform any faster or slower...need more time to play with it though. I did run SuperPi for kicks, returned times as follows - 1M - 37 seconds 2M - 1:26 8M - 6:39 There was one instance, early on, while using Media Player that the system re-started on its own. The Event Log was clear...no explanation for that. Most likely a software conflict somewhere. It was a, knock on wood, a one-time thing. Outside of that...not sure what else to say. I like it. In areas it seems faster...certainly no slower than Windows XP Pro x32.