The Windows 95 ProductID is not on the install CD or floppys, only a formula
for verifying that you entered a valid ProductID.
If you registered your Windows 95, then Microsoft Tech Support may be able
to help you.
If this is an OEM version of Windows 95, then tech support at the
manufacturer may be able to help you. (Examples of OEMs: Dell, Gateway,
It is possible that you could buy a copy of Windows 95 including a valid
ProductID from a source such as Ebay.
If you are not concerned about Microsofts copyrights and end-user
agreements, then Google Groups is your freind: