BleepingComputer.com: Broken into system

Okay so I think someone is breaking into my computer system. For the last few wks I think that someone has been accessing my files. I live in a 12 bedroom university area boarding house and we all use have ethernet cables running from a single router attached to the modem. I have Norton 360 and several times a day I get an ip conflict message as well as my computer slows down. I have sharing of files turned off as well as remote access permissions. Can someone please help me secure my system against further threats.

• Simple Ways To Secure Your Privacy:

• The Simplest Security: A Guide To Better Password Practices
  
• Securing Privacy Part 1: Hardware Issues
  
• Securing Privacy Part 2: Software Issues
  
• Securing Privacy Part 3: E-mail Issues
  
• Securing Privacy Part 4: Internet Issues

• Security Resources from Microsoft:

• Threats and Countermeasures: Security Settings in Windows Server 2003 and Windows XP
  
• Threats and Countermeasures: Security Settings in Windows Server 2008 and Windows Vista
  
• Microsoft Solutions for Security: The Antivirus Defense-in-Depth Guide

• Other Security Resources:

• Simple and easy ways to keep your computer safe and secure on the Internet
  
• Cyber-Security: Tips For Safe Computing
  
• Hardening Windows Security - Part 1 & Part 2
  
• How to Stop 11 Hidden Security Threats
  
• Your Guide To Staying Safe Online
  
• How Malware Spreads - How did I get infected

This post has been edited by quietman7: 28 September 2010 - 06:52 AM