what you need to do is:
1) diable the SCP client (if the SCP client is configured properly it should move to "safe" application running)
2) install SEP
3) re-enable SCP
now,
please pay attantion that when you re-enable the SCP could kill the SEP client because of some things:
1) SCP doesn't like that other software is touching files (SEP is an anti-virus, it must touch files)
2) SCP doesn't like that other software is managing a firewall and blockes things as well.
things you must do:
1) open the SCP console and define SEP client as a "Safe program", you could even define SEP as a "Full Priviliged Program".
2) open the SEP manager and define Centrelized exception policy that would not scan the SCP client folder on clients.
after that both programs would work fine together.
cheers,
Naor .P.