2. how can i use cisco vpn client and juniper at the same pc ?
You can install both Cisco VPN client as well as NS Remote client at the same PC. If you are using Cisco VPN client regularly, just change the startup option of the services called SafeNet IKE Service and SafeNet Monitor Service to MANUAL instead of automatic.
Just note that if you are going to use NS Remote, disable Cisco System VPN service and start the 2 SafeNet services.
Cheers
CT