connection error


I have the following problem:

I have installed Endnote X3 but while trying to connect to PubMed I get the error message: 

a connection with the server could not be established (with some other databases connection works).

It is on a Windows XP computer, no firewall. Surprisingly, this problem occurs just by one of the users of the computer (not admin), for admin and some other user which is also not admin, there is no problem to connect with PubMed. Can somebody help me?