Is the issue confined to Internet explorer? If yes, which version of Internet explorer you have?
Pop-up Blocker is turned on in Internet Explorer by default. To turn it off or to turn it on again if you've already turned it off, follow these steps:
Open Internet Explorer by clicking the Start button, and then clicking Internet Explorer.
Click the Tools button, and then click Pop-up Blocker.
Do one of the following:
To turn off Pop-up Blocker, click Turn Off Pop-up Blocker.
To turn on Pop-up Blocker, click Turn On Pop-up Blocker.