Hi I'm running V4 of Nod32 on a MSI P35 board with an E8400 Core 2 Duo with 2 Gb of DDR2 Ram. On this machine the scan runs overnight on Win XP Pro SP3 but in the morning the computer feels a bit sluggish. Normally opening programs like Mail and Firefox is instant and coming out of screen saver. But after an In Depth scan has been run programs take a couple of seconds to run and coming out of screen saver is also sluggish. Any ideas?