I can Only right click Open mail in new window to receive

In my Yahoo mail account it starts very slow to bring in mail. Then when it shows the new messages, I click but it won't open the message. So I right click and click "Open in new window" It opens that mail, but then I always have 2 windows open and it's extremely slow. Then when I send a messg, I select the names of people to send to, it may take up to a minute to actually enter the names into "To" or "CC:" or "BCC:" This is a fairly new computer, and this is a fairly new problem. Is it a virus or spyware??

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