Hi Ujjwal915560,
Thanks for posting. Apologies that your system is not performing as expected.
Unfortunately the only Operating Systems shipped with this 2009 computer were Vista and Windows 7. Since Dell has not tested this system to work with Windows 10, it would not be supported.
While you may get Windows 10 to work with this older machine, the drivers from Dell won't be available.
If you need additional assistance, please contact me privately. Be sure to include your personal information and your computer's service tag number. Thanks.