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I've been having problems with the LOTRO client locking up (stops responding) on zoning. It's been happening literally about 1/5 of the time I zone, including just going in and out of buildings in Bree. I contacted their support and the below response is what I got. Does this sound right? I haven't had this problem in any of the several other MMO's I've played with this OS.
Thank you for your reply. We believe this problem is related to memory limitations in 32-bit versions of Windows, such as the one you are using. In these versions of Windows, the operating system has problems handling processes once they pass a certain size. When the LOTRO client process passes a size that windows can no longer handle stability, LOTRO crashes. Lowering video settings or disabling sound can reduce the occurrence of these crashes by causing the LOTRO client to use less memory. Other players have detailed a Windows change that allows it to handle larger processes, detailed here. Please not that these steps are not officially supported and that we cannot guarantee they will work for you.
The long term solution for this problem would be upgrading to a 64-bit version of Windows that does not have this memory limitation.