Yes, I have an Intel Core i7-2630QM processor in my notebook, but the Intel Processor Diagnostic Tools recognizes only two physical cores.
You can see in the attached figure.
I did not make any changes to the BIOS. With msconfig I only excludes some programs to initiate such as DAEMON, VMware Tray.
You can see all disabled programs in the attached figure.
I will load the default BIOS setup, to see if the problem is fixed.
Any help from you will be appreciated.