After installing the first update is exceeding 90MB. Is this normal or am I waisting money?
normal, after that it is really small. Also to avoid having to do it again you can go to c:\program files\comodo\comodo internet security\scanners and find the bases.cav file right click copy it and save it in another location. If for some odd reason you have to reinstall you can easily put in back in the scanners folder so you will not have to redownland it again.