Do you mean LiveSafe or perhaps VirusScan? No product is called LiveScan that I'm aware of.
On your Desktop App there should be a McAfee icon next to the clock at lower right or on the actual desktop.
Double-click to Open McAfee SecurityCenter.
Go to Virus and Spyware Protection > Real-Time Scanning and click "Turn Off" then tell it for how long.
Make sure it's back on once finished.