ESET Nod32 antivirus free trouble shooter needed.?

I actually tried to install it in my pc. I wasn't aware that another antivir was already installed not until I was done installing it. So immediately I uninstalled the other antivir. The problem now is that when I uninstalled the other antivir, a prompt appeared saying NOD32 was not properly installed and that theres an error that occured. Right after the other antivir was uninstalled, ESET Nod32 wont run and it no longer appears in the task bar. I tried to view it in thr add/remove software from control panel but it doesn't appear there either. I tried to reinstall it but it wont because some of its components are already installed but cannot be overwrited nor deleted manually due ti DEP. What do I do?