When i open any file or folder.It will take too much time.In future how to get ride.?

I am regulerly scan my pc with best antivirus and spyware.But still i have problem.I am using IBM laptop 40gb, 240 MB ram,

2.40 ghz, window xp pro.

When i open any file or folder.It will take too much time.In future how to get ride.?nortan antivirus

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