This is a tricky issue, because there could be loads of things which case slowdowns. However, virus scanners, especially ones with resident shiels or active protection tend to use alot of resources. I know that Norton Antivirus uses quite a bunch, but I can hardly notice it on my machine.
Is running programs slooowwww...? I tend to de-activate my virus scanner when playing games etc, to stop my PC from going choppy.
|Desktop PC| |Macbook Air 13" (Mid 2013)|
|Windows 8.1 Pro (x64)| |AMD FX 4100 Black Edition 3.6 GHz @ 4.0 GHz OC| |Arctic Cooling Freezer 13 PRO| |Gigabyte Nvidia GeForce GTX 560 Super Overclock 1GB| |ASUS M5A78L-M/USB3 Motherboard| |Samsung 840 Pro 256GB SSD SATA III HDD| |Kingston HyperX 8GB PC3-14900 DDR3-1866| |OCZ ModXStream Pro 700W Modular PSU| |NZXT Vulcan Micro ATX Case|