server is being hacked

every month I am finding either one or two services that are hack
services. I delete the files and clean the service in the registry
then between 1 and 3 months a new hack is on my server. I have
symantec 10.2 and symantec for exchange and a barracuda on the outside
of my network. Can any one help to find the root of this issue. I use
the normal tools like rootkit revealer and aports for scanning my
ports but still they get in. I check my server a few times a day and
usually I catch it within a day but that might be to late. My updates
and patches are up to date. I am running SBS 2003 sp2 and exchange
2003 sp1.

Thank You
.

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