Problem with NOD32v2 and Windows 2000

Guys,

we installed IMON on a W2000 box. This box is using ISA server as proxy. After we install NOD32, all the W2000 boxes on the network stopped receiving emails. So, we uninstalled NOD32, but the problem continued.

We found some solutions in Wilders forum (winsockfix, reinstall winsock, etc) but none of them seems to work.

We instelled another proxy, just for testing, but the problem still. So, it's not a proxy issue, NOD32 modified something of the Windows itself, and now we can receive emails in that box and in all W2000 boxes on the network that use the first box as proxy.

We're using latest NOD32 version (not the beta), downloaded from NOD32 web site.

What else can we do?

Regards,

Ignacio