Lenovo G560 laptop
Antivirus not working

Dear sir,

i have purchased lenovo G560 laptop on 27/12.

i have been provided mcaafe antivirus free for 12 moths asper scheme from the company.

after using net when i scan my comp., every time it ask for restart comp after removing trojans.so i aply restart . after that comp.restarts but 'yahoo' site does not opens everytime i scan process.

now i remove trojans using another antivirus the so called problem does not occurs.

that means provided antivirus Mcaafe is not responding very friquiently.

I request you to do needful in favour of me