(everything!) command not found

[DY]

After my XP laptop died I have gone to Vista.  I installed cygwin on 
vista, then did ash and
rebaseall, and now when I run cygwin, no matter what I do it says 
"command not found".  I
thought it was a permissions thing so (I think) I changed the 
permissions by unclicking the
"Read only" button under properties for all cygwin files in vista, but I 
can't actually tell whether
I changed the permissions because I can't do "ls -la".  Also, on XP the 
command prompt
defaulted to something other than bash-3.2$.  I'm not sure if that's a 
problem - but it's a bit
strange.

Please help.  I've been googling for solutions for days now.   I would 
really prefer if you could
put things in simple instructions for me. 

Thank you!!
-Debra

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