How do I remove Shared Computers?

I've reached my threshold with this computer. I have a MACBOOK PRO, I've reviewed all the information on the blogs as well in doing searches on the web looking for more answers.
Disabled shared users, unchecked everything, changed my passwords, deleted their wifi off my keychain, gone to preferences in finder, Unchecked "connected Servers," and still this persons computer keeps showing up every 2 minutes I connect to my wifi. I don't speak to this person anymore, and oddly every time their computer shows up on the list, mine slows down and begins to have a giant lag in everything I'm trying to do.
I'm not sure if they're hacked into my system, but this is driving me insane. I'm on the verge of throwing my computer into the wall.
PLEASE HELP! SOMEONE! ANYONE!?

Devices that show up on the SHARED list in the sidebar of a Finder window do not represent devices that are hacking into or connected to your machine. They are devices on the same network that are available to be connected to.
Does this person live nearby? If so, he/she is likely still using your wireless network, so the machine is showing up when your machine queries the network. Change your wireless network's password to lock him/her out.
If this person does not live nearby, are you still sharing an Apple ID? If so, that could cause a remote Mac using the same Apple ID and with Back to My Mac enabled to show up there. If this Apple ID is yours, and he/she should not be using it, change the Apple ID password. If it is not yours, you will need to create your own Apple ID, sign out of the old Apple ID in System Preferences -> iCloud, then sign in to the new Apple ID.
As for the lag, that is purely coincidental. A device that shows up in the SHARED list cannot in any way affect the performance of your Mac. The only exception would be if you were to try to connect to that device... if the connection is poor, it could affect performance. If you have connected, you need to disconnect to restore performance. If you don't know how to do that, just restart the computer.

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_This is a AFP Multicast (udp/5353)_
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21:08:18.189071 IP (tos 0x18, ttl 255, id 26790, offset 0, flags [none], proto: UDP (17), length: 232) 192.168.15.101.5353 > 224.0.0.251.5353: [udp sum ok] 0*- [0q] 5/0/1 Melissa.device-info.tcp.local. TXT "model=MacBook2,1", Melissa.afpovertcp.tcp.local. (Cache flush) SRV Macintosh-3.local.:548 0 0, Melissa.afpovertcp.tcp.local. (Cache flush) TXT "", services._dns-sd.udp.local. PTR afpovertcp.tcp.local., afpovertcp.tcp.local. PTR Melissa.afpovertcp.tcp.local. ar: Macintosh-3.local. (Cache flush) A 192.168.15.101 (204)
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21:06:34.226681 IP (tos 0x0, ttl 64, id 41952, offset 0, flags [none], proto: UDP (17), length: 78) 192.168.15.101.50581 > 192.168.15.255.137: [udp sum ok]
NBT UDP PACKET(137): QUERY; REQUEST; BROADCAST
TrnID=0x28DB
OpCode=0
NmFlags=0x11
Rcode=0
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AnswerCount=0
AuthorityCount=0
AddressRecCount=0
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Name=_MSBROWSE_ NameType=0x01 (Unknown)
QuestionType=0x20
QuestionClass=0x1
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0x0060: 3630 0d0a 4c6f 6361 7469 6f6e 3a68 7474 60..Location:htt
0x0070: 703a 2f2f 3139 322e 3136 382e 3135 2e31 p://192.168.15.1
0x0080: 3a38 302f 7570 6e70 2f73 6572 7669 6365 :80/upnp/service
0x0090: 2f64 6573 5f70 7070 2e78 6d6c 0d0a 4e54 /des_ppp.xml..NT
0x00a0: 3a75 726e 3a73 6368 656d 6173 2d75 706e :urn:schemas-upn
0x00b0: 702d 6f72 673a 7365 7276 6963 653a 5741 p-org:service:WA
0x00c0: 4e50 5050 436f 6e6e 6563 7469 6f6e 3a31 NPPPConnection:1
0x00d0: 0d0a 4e54 533a 7373 6470 3a61 6c69 7665 ..NTS:ssdp:alive
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