Dell Inspiron n5110 critically slow

Hello everyone !! 

I am a dell user for the past 3 years and 4 months. I bought Dell inspiron n5110 core i7, 8GB RAM, 1GB graphic card, NVIDIA. It was running perfectly till the time I changed its windows. I used windows 7 professional for more than 2 years but when I re-installed the windows 7 ultimate the whole system went very slow. it took almost 1-2  minutes for just loading DELL INITIAL STARTUP SCREEN WITH DELL logo on it.

I installed all the drivers correctly. I got this issue fixed from a repair shop, but they didn't gave me all the information about problem and the solution.

Now once again this issue came back. I installed windows 10, updated/downloaded all the drivers online. 

After 3-4 minutes of very slow processing I reach windows 10 loading screen, the loading sign (dotted circle) appears very slowly, one dot per second 😕

I tried by taking the RAM out from slot and installing it back again but the issue remains the same. 

Please help me.


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