Hi After reading the ultimate folding@home guide in Custom PC. I am trying to run the fah-SMP-591.exe (Windows SMP 5.91 beta client (for MPICH) 5.9 )on two machines with 64BIT Server 2008. When I run it I get the following error. C:\Users\Administrator\FAH>fah-SMP-591.exe Note: Please read the license agreement (fah-SMP-591.exe -license). Further use of this software requires that you have read and accepted this agreement. 'mpiexec' is not recognized as an internal or external command, operable program or batch file. [12:27:30] Error running mpiexec. Please check your configuration and re-run in stall.bat if necessary Reading this I can see two things.. Firstly - Must accept the licence agreemenet(-license) I assumed this was a switch - but this did not work. Secondly re-run the install.bat - where is this? I was under the impression this gets put in the specified directory after the installer has run. As you can see I have created a folder in the user profile called FAH as per instructions and UAC is off. Can anyone help? Steve