Why Antivirus Avira for window 7 is blocking .Exe files continuously?

Hi to everyone. As antivirus is powerful program to save your data from different virus. Spyware etc. I have installed avira for this purpose but after installation it is blocking files containing .Exe like software setups, web page files. I have restarted computer but same problem. Please tell me what to do as it is creating big headache for me.
