hi guys,
i'm trying to run a MSI from command line to uninstall the installed
version. i tried the options given on this site but i'm not getting
where i'm making mistake

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/stand
ard_installer_command_line_options.asp

the comandline i'm trying is:

product_msi.msi /uninstall

and the output i'm getting is :

this patch package could not be opened. verify that the patch package
exists and............

can anyone tell me how to use command line to uninstall the product.

Note: the product is made by my company in .net 2.0. it is not a
microsoft prodcut i'm trying to uninstall.

thanks,
Lucky