Every download of Msgplus has the
optional sponsor program. You just have to decline it as shown here:
The ad-ware included in msgplus does nothing more then install ads.
When a good programer releases a good quality product for free, they have to do something to pay the bills and this is Patchou's solution! So, follow the instructions provided by sean and install msgplus and rather then volintarily (sp?) installing the sponsor, Decline it and enjoy.
On another note, The ad-ware will not cause system instablity unless it's already unstable or you attempt to remove it the wrong way (adaware, s&d, hijackthis)