On one of our business computers we have been having Avast for a couple of years now. Well somehow some Malware or a virus got past Avast. I have no idea how it happened, but we are always getting popups for objects such as tpsearch.me, search-world.biz, nemo-finder.me... Lately we have been having a lot of issues with this machine and now it barely works and we can't even use our POS system. What should I do to fix this?