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Hi, I am using photoshop for last one year. But from a few days I am encountering a peculiar problem with my photoshop. When I select something by using the marquee tool (it can be any of marquee tools) it started fine but after some selection it automatically select the area and i have to start back from the starting point. I can't make out what actually is happening. I am here giving the specs of my computer and the screenshot of the performance window. I don't if they will be helpful or not.

My computer's spec:

processor -> Intel Dual Core 2.5GHz

MotherBoard -> Asus P5KPL AM PS

Graphics -> ATI READON 4650 HD

RAM -> 4GB DDR2

HDD => 1 TB

Screenshot of Performance

Please solve my problem because it's harming my work as lasso is a very important tool of photoshop and I can't use it.