Google chrome cannot access internet .possible virus

Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! See posting ( https://support.avg.com/answers?id=906b00000004o01 ).

some days ago,my computer started flashing and buzzing.it informed me that I had a virus,and gave out an 800 number asking to call for help. the 800 number belonged to mcAfee anti virus.However my anti virus company is AVG.  I am contacting you on my new computer,by the name of King Lear,which is working fine. I am very concerned about some valuable files on my old computer.please help.

Art, Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! Other posting (https://support.avg.com/answers?id=906b0000000D5hnAAC).
AVG Guru 
Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! See posting ( https://support.avg.com/answers?id=906b00000004o01 ).