Sort:  

it takes time , once shares get confirmed your balance would be updated, it will take a while though, may be 2 - 3 days

Not sure, haven't heard of MinerGate. Maybe it's a delay in the relay, and it takes longer for your shares to register on the site database?

cheers

It seems to be a VIRUS take your pick of solutions
https://duckduckgo.com/?q=minergate+virus&t=canonical&ia=web