Many software and hardware companies have been emailing their customers to advise of the 'end of life' of Windows XP, which Microsoft will stop supporting in April 2014.
All versions of JETCAM Expert up to and including v16 will run on Windows XP.
In our tests v18 does run under Windows XP, however the high performance nesting that is shipped with v18 does not run under XP. Previous versions of high performance nesting (e.g. those shipped/purchased with v16 or below) did work in our tests, but given the diminishing support that Microsoft are providing for XP in code we recommend that all users migrate to a newer OS.