LAPTOP still slow after cleaning laptop

[va5]

My laptop is still slow after gave it to a computer expert for cleaning.🙁
Any solutions would be very helpful.

 

[va5]

My laptop link
http/www.sony.co.in/product/svs13a15gg
LAPTOP Specs

Windows 7 Ultimate
8GB RAM
Nvidia GT640M LE (2GB Dedicated) , Intel HD Graphics
750 GB HDD
64 BIT
Intel Core i7 3520M @ 2.90 GHz

 

[va5]

No I know my HDD is fine. Do we need to apply a thermal paste after cleaning fan?

 

[va5]

Cleaning will only speed it up if it was having heating issues.

What does like to happen to laptops is their HDD's start to die and this causes a lot of hanging. You could upgrade your current HDD to a Samsung 840 Evo, and it would likely solve your problem.

However, I would definitely run some disk check utilities.

My laptop is new its not old but still there are lags during Gaming. I think there is no problem with my HDD.