May I ask why there are antivirus program indicate the MsgPlus has Trojan and unwanted materials
I have installed Returnil and Mcafee antivirus plus
the nofications are here (click the images to enlarge them):







(click the images to enlarge them)

The older versions of Messenger Plus! Live came with a sponsor that was usually classed as "Adware", it wasn't malicious, it was entirely optional to install, but would display approved popup adverts at certain intervals.

For this reason, things like McAfee site advisor class it as dangerous software.

However that relates to old versions, for several incarnations now, the ad-ware has been removed and replaced with a different optional sponsor (a browser add-on toolbar in this instance)

We can assure you that Messenger Plus! Live is 100% safe to download and install as long as you get it from the official site

In addition to what djdannyp said: in the first picture, designevolved.net is indicated in red simply because it links back to msgpluslive.net.

Also, I took the liberty of resizing your images as they stretched the page

ok,I have used the software a long time but I changed my PC and the antivirus softwares, I found out this.
I just intstall the software again. Thanks.

Use Microsoft Security Essentials.

It's free and doesn't (currently) falsely accuse Plus! of being malware.

More info about it see here and here.