There are many factors that can go wrong with the operating system and other software on laptops. These days many laptops have customised software installed according to a persons needs. Try to go into Safemode by pressing the F8 key on your keyboard and try to do clean up your laptop using antivirus.
If the need arises to reformat the laptop, reinstall the operating system from the CDs that were supplied with the laptop. Also make sure that the drivers CD’s are available at the time of installation.

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