Tasks has stopped working

[sac1128]

I removed Windows 8.1 from my computer and installed Windows 7. Everything works great, with the exception of an error that pops up when booting up the machine. I get the error below. It closes on its own after a second or two and hasn't affected typical use of the computer thus far. However, I'd still like to get rid of it. Any ideas on how to stop this from happening?

 

[sac1128]

What I really mean is how do I fix the problem? It began after I installed the drivers for my computer. I checked and they are all current.