Some times,in yahoo.mail, it was not responding when I close the browse? What made this problems?

I use the laptop Sony Vaio, 2 core, 2GB ram, the modern verson, and Window Vista. I Use the Internet explore, the newest update version. And this problem just was happened with Yahoo.mail. Sometimes it was happened 4 times a day. I use Yahoo.mail for along time and nothing happened with another computers. How about your recommend? What 's wrong? The internet browse or the Window Vista, or my computer( ???)

Some times,in yahoo.mail, it was not responding when I close the browse? What made this problems?ie tab

When you close the browser it is actually clearing the cashe for you to keep it clean for the next use.