You might also try uninstalling any programs (especially) freeware that
you've installed in the last few days. You may find that one of them is
causing this.
A System Restore may help. I would not use a Restore point older than 4 or 5
days.
You may be infected with malware (adware, spyware, etc)
You may have to register and post a HijackThis log to one of these forums
for additional help. Look for the proper forum and an "Important- Read This
First" message so that you follow proper procedure.
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