About problem MPI system in 64 bit windows system for lammps software

Dear Sir,
I installed Windows Server 2008 R2 Enterprise 64 bit in a computer having 16 processor in 2 CPU. Then I installed MPCH2 64 bit and I copy lamps windows execution file. Then I tried to run a problem using 8 processor following the command in LAMMPS manual which I run in a single processor 32 bit window successfully… But it gives error like mpiexec is not found. Please give me suggestion so that I can solve the problem.

Thanks
Sankar

Sounds like a path problem, not a LAMMPS problem.
I would work to get to the point you can run any MPI
job, like the examples provided with MPICH, then
see if you can run the LAMMPS exe.

Steve