infected with Trojen-downloader .js.ifr-

I have mac running osx 105 with kaspersky internet security. All up to date. I have not downloaded anything not approved by apple and do not visit sites not approved or certificate. · days my computer was acting strange, files stops uploading on hightail. Then problems really started. I could not do a full scan, after about 3% it said scan complete, that was after 5 minutes, a full scan normally takes 1.7 hours. I opened in safe mode but kaspersky would not open message always said opening. I could not scan. I could however download files in safe so I re installed kaspersky. I then opened mac in normal mode and was able to install new virus. THEN I RAN A SCAN AND IT FOUND 2x trojen-downloader active threats. It removed them but all is not OK. I cannot access apple sites, my emails freaking out , all web `pages untrusted, BANK log in- fake web site, asks for personel details, I now cannot do full scan-, cannot go to apple updates message cannot connect, I am wrting this from a PC as I don’t dare play with my Mac until the right help arrives……

what do i do....