I am having problems running the abaqus input file. can anyone help me step by step please? when I open the command window, the default directory is c:\temp
Right click on the command window icon and properties. Target will show you the directory it opens at. Otherwise type in cd "name" to change directory.
That error makes me think that the Abaqus installation didn't finish correctly. The installer should have put several 'commands' into you PATH variable so if you type what Jlog50 described Abaqus will run.
You should reinstall Abaqus. I am not sure if it is required but you should make sure you are doing it with administrator privileges.