For more information on the 32804 error, please check the response to the following Developer Exchange post.
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000002C770000&UCATEGORY_0=_18_%24_17_&UCATEGORY_S=0
I have no knowledge of any problems with FieldPoint Explorer 3.0 and Windows XP, but if I recall correctly, Windows XP was released after FP Explorer 3.0. You may want to try upgrading to 3.0.2.
Regards,
Aaron
LabVIEW Champion, CLA, CPI