When you are saying "50 piece"...you're not talking about loading 50 separate instruments in, right? Because you would be lucky to get half that many at a single mic position with your system and Platinum. It's a very resource hungry library.
P4 2.6 Ghz
2 Gig Apacer 3200 RAM
60 GB OS IDE Drive
1 Terrabyte of HD space for Samples
Audiophile 24/96 and E-MU 1212m (using 1212m in test)
1.61 GB Available - At the start
1.49 GB Available - After loading Kompakt in Overture 4
1.41 GB Available - After loading the 50 piece string Ens. Fast patch (Close)
30+ voices played no problem (12% CPU)
No RAM warning
DFD is Active
Preload 192 kb
248 reserved voices
Voice buffer size 348 kb
93 MB Reserved RAM
Works okay with Lock Memory No Swap On or Off, makes no difference.
Is this the only thing loaded when you get the error message? How much free memory is available (cntrl+alt+delete, check physical memory on Performance tab)? Do you get the same warning in plugin and standalone settings?
You could try reinstalling DFD. It is also easy to just reinstall the Kompakt player itself. It won't harm your registration to reinstall.