Actually this could have been due to so many reasons. If you had given more information I would have been more specific. But I will tell you what to do:
- You can basically try a different browser.
- Install fire fox (a new copy).
- Install updates to the fire fox.
- Check whether you have accidently changed the properties of fire fox.
- Find out whether the copy of windows seven you are using is original.
- Perform a full virus scan.
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inbox repair tool