Programs appearing in my hp administrator

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My Norton subscription expired, so I do not have virus scanner or antivirus.
please help, because programs have been randomly appearing in my hp administrator (documents and settings). I don't know if they're harmful, but my norton gives me a message saying low risk pbjcpu.exe or something. Sometimes the things pop up, and sometimes they don't occur in hours. The name of the program always changes.
 
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