Windows installation problem

[Ian Riley]

Installing LyX from lyx-143-5.exe on two different Windows machines (XP 
and Win2000), both resulted in an error, "LyXTextClassList::Read: no 
textclasses found!", each time it is run.  Reinstallation did not 
resolve the problem.

LyX installs and runs flawlessly under Dapper Ubuntu at home.
Does anyway know of a solution?  Thanks, Ian