Hi @Jerin P Thankachan,
What have you tried to do to resolve the problem?
Some examples of what you can do:
Run a complete anti virus scan of the HDD either using Windows defender (inbuilt A/V program) or the 3rd party A/V program that may be installed.
Run an anti malware - example only scan and check the results.
Check your system files are all OK
Start your laptop in safe mode and check the start up time. If it gets to the desktop more quickly then you may have a driver problem. Check that the video drivers are the latest available for your model as they usually cause the most problems. What is the model number of the laptop?
Look in Event Viewer for any outstanding Critical, Error and Warning events that may tell you what is happening. To get to Event Viewer, right click on the Windows Start button on the left side of the Taskbar and then click on the event viewer link. Click (double click?) on any outstanding event (lots of entries)and then check online what it means using Event ID and Source information.
Have you checked that Windows is the latest updates. Go to Settings > Update and security > Windows update.
There are a lot of things that can make a PC run slowly but with a bit of patience you may be able to find out the cause and fix it.