I tried to install in windows2000 Adobe Acrobat7 and I got the following message: "Error 1324. The path My Documents or the volume is invalid. Please enter it again." I did not install on My Documents.

Thank you for your suggestions.

Here's (http://support.microsoft.com/?kbid=325069) what Micro$oft has to say about this error message.
It may help

I checked the values of those entries and they are 0. What is next?.