Styx online

I was downloading the IE flash updates from filehippo.com. While installing one, comodo firewall picked up something called Au_.exe as a suspect file. I clicked on it's information, and it said it was signed to macromedia, so I assumed that it was safe. However almost immediately comodo started popping up more programs - Bu_.exe, Cu_.exe, Du_.exe, Eu_.exe, Fu_.exe and Gu_.exe. This struck me as quite strange, so I blocked them all, and after doing some research it seems the original Au_.exe could be a bad thing. Any tips to making sure?