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I do have only 1 core and that [multiple-processor] setting is always '1'. Altera's engineer told me to turn off 'HyperThreading' of my Pentium 4 CPU, I will try that, maybe the Quartus II is not compatible with that stuff
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I've had hyper-threading enabled on my single-core Pentium 4 for several Quartus versions with no trouble. The Quartus handbook does sound like the official recommendation is not to use it (see end of handbook quote below), but I suspect the restriction is really only for when you set "Maximum processors allowed for parallel compilation" to a number greater than 1.
From the Quartus handbook, Volume 2, Section III, Chapter 8, under "Use Multiple Processors for Parallel Compilation":
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Do not consider processors with Intel Hyper-Threading to be more than one processor. If you have a single processor with Intel Hyper-Threading enabled, you should set the number of processors to one. Altera recommends that you do not use the Intel Hyper-Threading feature for Quartus II compilations.
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