Can't find the problem to my laptop!

Hi, i just bought the laptop about a year ago. Recently had problems and i rebooted it.
After rebooting, my laptop is still terribly lagging. When playing a game of League of Legends, it keeps on having spikes and the game sound would lag very badly. Please help.
This laptop use to be a very fun gaming laptop of mine, but its so worthless now.
What do i do?

Processor: Intel(R) Core(TM) i7-2760QM CPU @ 2.40Ghz 2.40 GH
Graphics: NVIDIA Geforce GT 540m

Please email me at EDIT: email address removed by Moderator

Thank you for your help!
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  1. is u r laptop overheating ?,did it lagg always i mean when not gaminng also,did u r laptop ever reported virus issues ...
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