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problem with unmanaged package

Hello ,
I have one unmanaged package , i installed it . I created some cutom fields which i require for some s- control . Then i created some accounts and leads .
 Now i have one more unmanaged package with some changes But when i install it it gives me error that these custom fileds are already present so can not install the package . I can not delete the custom fields as i delete those i will lose my previous data in cutom fields .
As far as publisher point of view , i can not create the unmanaged package without the custom fields bcoz as i add my cutom scontrols of custom links which requires custom fileds , custom fields get automatically added . So what i can i do in role of publisher as well as installer ?
Please help me in this matter .