Mouse Causing Minor Irritations

I noticed today my mouse causes strange behavior now and then such as click and hold titlebar of my browser and it maximizes it when i only wanted to move it a bit,click close button on say wordpad and some game mod zip file under the close button i clicked opens up,in my thunderbird email client when i click a message to read it a window opens with the message i clicked in it,and after installing three new games on my computer one of the icons i clicked and held to move it just started the game!No major problems so far,just occasional irritants throughout the day.Anyone knows what happened?How to fix this?

Edit 1:I clicked a zip file for a game soundtrack and then extract.When i checked "create a folder from archive name" and "Use subfolder info" the checkmark appeared then disappeared in each box i clicked.I clicked again carefully and the checkmarks stayed.Seems my mouse is VERY sensitive today for some reason!Oh,and i use zipgenius for the unzipping of the file. Edit 2:I tried to move the newly created folder with the soundtrack files to my music folder and they did the second time.The first time i clicked and held the file it opened it.Seems my mouse has become Way to sensitive!