my laptop is running slow day by day ?

[hahmadaziz]

can i update my Bios or increase Ram which is already 4 gb and i am also using different application on window and linux

 

[rgd1101]

can i update my Bios or increase Ram which is already 4 gb and i am also using different application on window and linux

depend on the exact model. try google the model with "ram upgrade"

 

[geofelt]

Do not try to update your bios unless the update has a fix for a problem that is impacting you.
It is unlikely to fix your problem, and a failed update will get you into a nasty recovery situation.

4gb is not enough these days.
Go to a web site like Kingston, crucial, corsair... and access their ram upgrade app.
Enter the make/model of your laptop and you will get a list of supported upgrades.

If your laptop is slowing down recently, what has changed?

Perhaps an update needs to be rolled back using system restore.

Perhaps you have accumulated malware.
Run malwarebytes free edition to check,

Perhaps your cooling has accumulated dust; try to clean out your vents.