hi all this is my first post so, i'm looking 4 the best antivirus 4 using

sony vaio, VGN-FE48G/H, vista home premium

Processor: intel® Core™2 CPU T7200 @2.00GHZ
memory (RAM): 1022MB
32-bit Operating system

Ps. the norton internet security was installed priviouslly on my laptop( provided ) but somthin hapend it stopped renewing or donno but well i lost it, tried win live one care==> too slow, now i have the norton 360 its really good but i donno
plus i think somtimes my sys slows down
sys performance= 4.5
thanks all