PGP Desktop - Outlook attachment opens as text file in PGP Zip not from Outlook into IE

Hi,

For a while a client had PGP Desktop working with Outlook whereby  when the client opens the attachment (a encrypted HTML Form) they are prompted to decrypt.

It decypts as a .dat file. They then click on it from the email and it opens into Internet Exploreer and then they print.

Now it was re-installed and now instead it decypts into PGP Desktop under the PGP Zip and its impossbile to view it or get it to open under IE.

I think what happened but I'm not sure is that the entire disk is being encrypted.

Anyhow how do I get it back to the previous behaviour.

Thanks

David j