Maybe that is the problem? I followed this guide:
but used the newest versions of the programs mentioned.
That's because we have Centos 5.3, but it's not a 64bit machine but an i386 machine.
I thought the x86_64 was only for 64bit machines due to the underscore connection line in that name.
Is there a possibility that things will be fixed if I use the guide you mention and do the missing parts?