Hi, reading your post made me wonder what is the default gateway of your switch?, is it the IP of vlan 5. Sounds like you want vlan 5 to be the management vlan. Also is your laptop on a port that is in vlan 5? if not you will need inter vlan routing enabled or assign te switchport to vlan 5. Did you do a ipconfig /all on your laptop and check the IP of the default gateway? I hope this is helpful for you, I am doig some guessing here due to the fact i dont know your entire network setup. Check out the link below.
!-- Set the IP address and default gateway for VLAN1 for management purposes.
3512xl#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
3512xl(config)#int vlan 1
3512xl(config-if)#ip address 10.10.10.2 255.255.255.0
3512xl(config-if)#exit
3512xl(config)#ip default-gateway 10.10.10.1
3512xl(config)#end
http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a00800949fd.shtml