I'd say it's a good thing you're getting the error. It's a dll file from the nasty MyWebSearch spyware app.At least it's not doing what it's supposed to be doing. Try running Spybot S/D (download here) and deleting your spyware app. It should speed up your comp and get rid of the error.
To make sure this doesn't happen again, NEVER GO TO MYWEBSEARCH.COM OR A WEBSITE CONNECTED TO IT!
If Spybot can't remove it, download and run this,this
and then run Spybot again to make sure it is fully removed.
Even if Spybot S/D finds the spyware app, it may not remove all of the trojan. To ensure the spyware/trojan is gone, run this