Sunbelt Software just released new Antivirus Software called VIPRE® Antivirus + Antispyware. This new high-performance security software from Sunbelt Software use a little resource on your system so that it doesn't slow down your PC.  Most of the computer at the company that I currently doing my internship are using F-Secure as their antivirus software. It took about 5 minutes to wait for the Windows to load compeletely and it took a lot of resource for just one software so it is impossible to open software like Dreamweaver CS3 or Adobe Photoshop.
Before this, I have tried one of the Sunbelt Software product called Sunbelt Personal Firewall. It is fast and light application for just a firewall application. For those who still don't feel conveince, you can try VIPRE® Antivirus + Antispyware for 15-day trial.
For more information about this product, you can visit their website by click here