[Then the program crashes also.]

Also I remember that sometimes the newdot.net name space extension plugin (beside others) is responsible for several funny freezings and crashes. If so, get Adaware (an ad/spyware catcher) at [http://www.voiceofthepublic.com/Lavasoft/index.htm]. This would be a good suggestion even if your crashes are not related to this, for maybe you will be very surprised what lurks on your HD.