when default printer changed then crystal report settings also getting changed why?

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VB

CrystalReports

hi,
sorry ,if its silly question,please forgive me..i developing crytsall report in visual studio 2008,i developed plenty of reports,i didn't get this problem but problem arrives when
i created separate page size in system using control pannel--->printer settings to--->8.5*13

for rest of report is ok,but for this customized paper size report size will be changed when i do some thing with default printer...for ex if changed my default printer from hp printer to samsung printer then automatically crystall report paper size will be reset from 8.5*13 to letter size why..?..please help me to resolve this problem