The Information and Communication Technology Center (ICTC) provides university wide antivirus solutions. Currently you can install either Symantec Antivirus Corporate Edition 8.0 or Trend Micro Office Scan 8.0 (vista compatible).
CCM Network recommends Microsoft Defender for spyware protection on user PCs.
Windows Defender is software that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software by detecting and removing known spyware from your computer. Windows Defender features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected, minimizes interruptions, and helps you stay productive.” –Microsoft.
You can also install Windows Defender from here: