What do u do with colleagues who like to stare at your computer screen and ur desk?

Its getting on my nerves that my colleague always like to come to talk to me and at the same time keep staring at my computer screen and my desk and it really irks me coz she is so rude!

Any ideas what i can do?
Update: I always hide n close my applications when she does that! But still cant get my hint...

She always like to talk to me while looking at my screen and examine the stuff i have on my desk..
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