AVG stalling on MacBook Air

Avg on my MacBook Air does not complete its scan and stalls or hangs at 67%.  it appears to be stop whilst scanning Macintosh HD, both AVG and the Mac are unto date with updates - any advice would be very welcome

Phil, In future please refrain from carrying out multiple topic postings on the same subject! You won't obtain an answer to your query any faster!. Also please try to keep the whole conversation in one question/thread to speed up any resolution. Please see your other posting (https://support.avg.com/answers?id=906b0000000DcCfAAK).
AVG Guru