'nmap' is not recognized as an internal or external command,

["Boyce, Augustine M. <CTR>" <Augustine.Boyce () associates dhs gov>]

Hello,

I work in a Windows 2005/2008, and Windows XP environment and I am having problems running Nmap.  It is a weird kind of 
problem, Nmap will run fine when I install it on my Windows XP machines, but after a week or more when I try to run it 
I get this error message: 'nmap' is not recognized as an internal or external command, operable program or batch file.
The Environment Variable is set properly.  I try to run it from the Nmap folder but the result is the same.  However, 
when I uninstall and reinstall it Nmap works fine.  I have bought the Nmap book (NMAP Network Scanning) to see if the 
solution is in there but to no avail.  I have also googled the issue and also checked the Nmap website but have not 
been able to find a solution.  Can you help me please?

Thanks,
Augustine
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