There are a number of reasons why this can happen. Sometimes it can be the result of installing a new program, or after years of use, the operating system simply needs a tune-up and a spring clean.
These days, however, the most common cause is that the PC is infected by either a virus or spyware or both.
You can check to see if you have a virus by clicking on the 'Do I have a virus?' link on this page which will direct you to websites which will scan your PC on-line.
To check if you have spyware on your PC, scan your system using the link below.
http://www.earthlink.net/software/nmfree/spyaudit/
And if you want to know what spyware is and how it gets on your system, read this excellent article:
http://www.doxdesk.com/parasite/
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