I have a fairly straight forward question. One of my clients wants to upgrade his Medisoft software to the latest version. His current server is an IBM xSeries 235 running server 2000. The new software will not run on 2000, so we thought to upgrade the OS on the server. There are only 5 workstations in the office, so it's light duty. Upon trying to install Server 2008 R2 standard, I received a message that the CPU's were not configured for 64-bit applications. So, can I put 64-bit processors into this machine? Currently they have two Xeon 2.4 Ghz Prestonia, socket 604 mPGA processors. Main board is xSeries 235 - [86714QX] according CPU-Z.