Installing programs on Windows XP Embedded (program gone after restart)

I have a thin client which runs Windows XP Embedded (it's not connected to a network so security is not important). I can use the administrator account to install a program. However when I restart the computer the program has been deleted/lost. How do I install a program so that it doesn't disappear on restart? Thanks!

Edit: I can answer my own question! Write access needs to be enabled (temporarily) using the command line: fbwfmgr /enable (fbwfmgr /disable afterwards). This is to protect the flash memory from unnecessary writes.

See pages 9-10 here for more info:
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I got the commands backwards: it's /disable to be allowed to make edits and /enable to protect from edits again.