How to fix Pc’s mouse issue?

Hi,
I am using Microsoft windows XP sp2. I am having a wired problem with my mouse. I have a laser USB mouse which is not working properly anymore. Actually, yesterday I was using my PC and suddenly it turned off because power was gone. Before that each and every hardware component of my PC was working fine but after that when I turned-on it there was a problem popping-up in the task bar that my USB mouse device is not working properly.
This is very shocking and irritating for me.
To handle this issue I firstly totally un-installed the USB mouse driver and again installed it but nothing was changed. Then I plugged a flash drive to see whether the USB port is working or not? But my USB ports are fine and it confirms that there is a problem with my mouse or its driver. At last, I bought a new mouse but it is also not working at all. I am very disturbed and shocked due to this problem because it is very much strange for me/or I have not face an issue like this so far.
So, my question is how to fix Pc’s mouse issue?
I am really very worried due to this issue and I want to know the solution of it.
