How to stop the certificate checking

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My phone installed WM6.5 ,Some time the application start slowly(5 to 10 minute) and show the error message "the file....cannot be opened either it is not signed with a trused certificate"

Thanks,

Have you installed NetCF 3.5 and sdcert?

if you haven't, try to install those cab first it may help.

Now i don't installed this software. i will try it.
Thank you for your advice.