Hi there!
As i understand you has lost your serial number and are trying to install Adobe on a new PC.
Have you ever registered your product online? Do you still have the original receipt? If so, call Adobe Customer Support and they would help you.
Next you could call your distributor from whom you bought the package(frys) and ask him for the receipt number or the serial number if he has the copy.
This statement is taken from Adobe site
"If you cannot find your serial number and it is not in our registration database, Adobe can reissue your serial number in certain cases. This applies only to current shipping versions of Adobe branded or Macromedia branded products, and one version prior to the current version. Please contact
Adobe Customer Service with a copy of your
Proof of Purchase "
Click on the link to find the above Statement,
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_15292&sliceId=2
Click on the below link to find Customer Service in your country and region,
http://www.adobe.com/support/contact/
Regards,
Olafsson.