seems some virus crashed my laptop

  manikurian 04:57 15 Dec 2015

iam using lenevo b40-30 laptop.os was win 8.1 . in this when click on one folder all the folders there getting selected and i cant do what i needs to.if i open those folders many windows are coming. so i changed my os to windows 7.and after all installation process iam unable to use windows.means windows not getting booted.its getting restarted and restarted. please tell me a solution for win 8.1 or this windows 7.anyone is enough.

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