Hi,
My name is Shashi and I work for the Social Media and Community Team at Dell.
Before I go ahead and help you with the troubleshooting steps I would like to know few things mentioned below:
Is it a laptop or a desktop?
What is the system model?
Is it an usb or a wireless mouse?
Have you done any steps by your own to resolve the issue?
Please revert with the above details.
Thanks,
Shashi K