some serious problems due to my laptop crashing . It shows BSOD with DPC WATCHDOG VIOLATION error as many as 3-4 times a day. This problem has increased since last few weeks. my laptop freezes and crashes randomly . Please provide a solution for this keeping in mind that I want to avoid upgrading my OS to windows 8.1 as it increases this problem and adds many other problems ,such as wifi drop,bluetooth now working properly ,fan running at continuously at high speed(even when no applications such as games or video etc are running ).

Please run driver verifier (DV) per the instructions in the link below, and hopefully we can eliminate the uncertainty..
Note: Make sure to read and remember the steps to reset DV in the event of a crash, and post a link to the newly generated crash dump here.
Driver Verifier-- tracking down a mis-behaving driver. Created by ZigZag3143, Co.authored by by JMH3143 http://answers.microsoft.com/en-us/windows/wiki/windows_other-system/driver-verifier-tracking-down-a-mis-behaving/f5cb4faf-556b-4b6d-95b3-c48669e4c983