This version is compiled specifically for the 64-bit modes of the AMD Athlon 64, AMD Athlon FX, AMD Opteron, and Intel Xeon EM64T CPUs. You must have the x64 Extended (64-bit) version of Windows to run the 64-bit version of VirtualDub. You cannot run this version on a 32-bit version of Windows even if your CPU is 64-bit capable.