I still find it hard that OP would cause a memory leak as it was designed for lower spec systems windows 98, P2 266ghz, 60gig hdd,64 mb of ram and low end agp card GForce MX440 I think.
I am wondering do you have any mods installed and installed them right?I never have problem with OP even on my old HP 1.5 P4 ,128 gig hdd and ram funny it can support windows 7.