Can't access many sites since downloading NIS 2010

Running Vista premium 64.  Downloaded NIS 2010 yesterday.  Since then, am unable to open many sites, including your dashboard online games, etc.  Screen freezes, then I get the message "Internet explorer has stopped working."  Soon after, I get another message stating "internet explorer has closed to protect your data."  It seems to be freezing when the java script is running.  Any ideas?