Symantec AntiVirus Client
1) Click on the Start menu and scroll up to Programs. Find the Symantec Client Security and select Symantec AntiVirus Client from the menu.

2) On the left side of the screen select Scan Computer. In the area that appears on the right check the box next to the C: drive.

3) Once the box is checked click on the scan button and the scan will begin.
Norton AntiVirus
1) Click on the Start menu and scroll up to Programs. Find the Norton AntiVirus Corporate Edition and select Norton AntiVirus Corporate Edition from the menu.
2) On the left side of the screen select Scan Computer. In the area that appears on the right check the box next to the C: drive.
3) Once the box is checked click on the scan button and the scan will begin.