Can someone help me?

[Amy]

If you did not have this problem until after you installed the W8 thing I would start with restoring your computer to a point before you installed it. To do this go to Start and open the Control Panel. Click Backup and Restore, Recover System Settings, Open System Restore and Next.

This will bring up a window showing some restore points. You may need to click the Show more Restore Points to find one that's long enough ago. It should be just before the problem started but no longer ago than that. Select it by clicking on it and then Next. Just keep clicking Next till it;s done restoring, it may take a few minutes. Restart and see if you're still having the same problem.