Good AV softwares, alternate to NAV

i have always relied on norton antivirus but with newer version i seem to have problems according to the following routing

first three months after installation is ok

fourth month the NAV starts to behave strange and consumes a lot o memory and CPU

fifth month the auto protect failes to load and when u try to load it manually NAV crashes and sometimes the OS too

sixth month u will have a lots of problem with computer being damn slow and the explorer crashing  frequenty or computer freezing up even when idle finally leading to corruption of explorer when u reinstallating the OS

seems like NAV itself is a virus so what r the better alternate virus scanner outs there

i tried Avast Pro and seems to do pretty good job consuming quite less memory and who needs all those damn annoying features of NAV anyway??

pmormr wrote: i use Symantec Corporate Antivirus System... it's pretty cool, you configure it to download updates automatically and you install the child program on all the other computers you wanna protect. Never given me any problems... ever

i agree with u in most of it however it is not what i would call a state of art network antivirus tho