I use Adobe Acrobat 9 in my business. But after a couple of re-installation it cannot be activated. I have been told that a re-intallation is for them, the same as a new computer installation (I wish!). I have tried CHAT and e-mailing them and getting no sensible response other than you should consider buying a new CD.

Has anyone had the same difficulty and how wai it resolved?

I haven't got a solution but presumably this revolves around the terms of the licence. If the licence says that you are limited to installation on just one PC only then that is that. If it says that you can install it on one PC at any one time, then you should not be stopped from activting (unless you install it on two obviously).

If you are within the terms of the licence, I would formally write to them pointing this out and telling them that they are obliged to activate your existing copy and that if they don't you will take legal action for breach of contract.