BleepingComputer.com: guest account protects from virus?

I usually don't bother with different accounts in Windows XP - I just use the administrator account for everything I do. After getting a virus/trojan I started to wonder, if I used a guest account for everyday browsing and work, would this provide some protection from a virus since I (or the virus) wouldn't have privileges to install any software.

Or is there another simple/fast way to lock down my computer from infections (in addition to anti-virus software)?

• About Limited User Accounts
  
• Why use a standard user account instead of an administrator account?
  
• Use a Non-Admin Account (Limited User Accounts) for Malware Prevention

• How To Create a Limited User Account In Windows XP
  
• How To Create a Limited User Account In Vista
  
• How To Set Up A Limited User Account In Windows 7 - Configuring Windows 7 for a Limited User Account

• Alternative: Running as Limited User - the Easy Way with Process Explorer
  
• Is Limited User Account enough?

• 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