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Check you Mouse in your friend MacBook. if mouse is not working then change your mouse but if working then
check your USB mouse slot.
check your drivers.
check for hardware failure.
check for more issue by http://support.apple.com/kb/TS3048 but no technical knowledge and still not able to solve then follow Mac Customer Service .
the new mouse is delicate and sensitive, both of which can be turned down in system preferences. the "gestures" on the mouse are such that the screen moves when you swipe your finger. Gestures can also be turned off in System Preferences under Mouse
Try to use just the keyboard to slove this problem.
Push the Window button near the leftCtr button, and enter with the arrows key in "Control Panel". After that, enter in "Mouse". Use TAB key and the arrows to go in folowing option "Hardware"/""Properties"/"Driver"/"Update Driver" and install.
Is your screen image also magnified?
It sounds like you accidentally zoomed the screen, which you can do by holding down the control key at the same time you are rolling the wheel on the mouse. When you do that, the screen will follow your mouse so that you can access portions of the screen that have "zoomed off."
Hold down the control key and roll the mouse wheel until you have zoomed all the way back in. Alternatively, visit System Preferences / Universal Access and modify the Zoom options to suit yourself.
Have you tried in safe mode?
Please check in safe mode, If the mice works then re-install os by selecting archieve and install.
Make sure to select the preserve user data tab while performing re-installation.