I know someone who installed Norton Internet Security 2012 on a PC which has a Dual Core Intel Atom CPU. NIS 2012 frequently says that the PC is running out of CPU. The PC has plenty of memory (At least 2 GB, I think 4 GB). The OS is Windows 7 Home Premium 64 bit. Please offer recommendations on which options to change in NIS 2012 to reduce the CPU usage. If you feel that there is not much that can be done to reduce CPU usage, please suggest a decent alternative AV (preferably free) with reduced CPU usage. Thanks in Advance.