Prevent spying malware from 'phoning home'

About a year ago I discovered pctattletale installed on my computer, and removed it per their instructions, which I think I recall consisted of deleting the executable, which of course didn't give me great confidence.

Recently, I had to replace my router, and in the process discovered the router's logs of web activity from my computer. Lo and behold, every now and then, my computer is contacting app.pctattletale.com.

I went through the procedures listed here on Major Geeks for removing malware, which conclude with 'now see if this has resolved the problem.' It's taken a while, but by watching the router logs I've again seen it contact app.pctattletale.com.

I am not going to have time to go through all the steps in those procedures again for a while -- maybe not for over a week -- plus the time to submit reports and get instructions from you wonderful folks. In the meantime, is there anything I can do to prevent outbound traffic to that URL?

Thanks!:confused