[LeFrettchen]

You might want to try the amd64 release and see if there is a difference.
It's worth a try.

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Also, you can check your BIOS settings, and see if everything is ok.

npx0 is the interface to the floating point math, either the hardware co-processor or the software math emulator.
Older i386 FPUs used interrupt 13, newer FPUs are able to use exception 16.

I don't know if it's possible to change anything in the BIOS for that, but it could worth taking a look.

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Or it could be a RAM issue. I mean, a physical issue.
How many RAM is available at boot ?
When booting, you can see the real mem and the avail mem.
real mem should be 256 MB, avail mem could be much lower.