This trojan blocker ( MD5: 99574198c64182ecd1c42bd466629ec1 ) prevents all software execution.
To remove the Trojan (and unlock windows), infected users need to enter a valid serial number.
Number to Call: 9154771955
Number to Call: 9153443682
Number to Call: 9153367209
How to unlock
First thing to type: XYLIBOX
The first serial to type is not really important, but the second and the last must be the same for unlock Windows plus your serial need to have 5 chars minimum in lenght and no letters, only numerics.
Run MBAM, to remove the infection.
pornoplayer.exe was also noticed here on the past (29 Nov 2k10)