Bought a new program on CD installs ok...BUT

When I download the update (norton said it was fine) it is still ok but when it comes to running the new update NIS2010 pops up saying it is behaving strangely and I should block it? How do I know what is the right thing to do?I have never come across this before.

Mbam did pick up something called adaware webhancer after I installed the CD I told it to remove the problem and I figured if it was part of the program I could easily re install.