Whats the best anti-virus software that does not use a lot of ram(i only got 256)?

Avast uses low system resources but acts as a real watch dog

Whats the best anti-virus software that does not use a lot of ram(i only got 256)?antispyware

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Whats the best anti-virus software that does not use a lot of ram(i only got 256)?best antivirus software

AVG Anti virus it's to useful and does it take alot of RAM