Mouse left click interlocked with a Fn key

This suddenly happened, whenever I left click my mouse, the windows help center is opening (which I figured out, comes up if you press F1 key)

So looks like, my left mouse click has been mapped to F1 key (I think so, please correct me if I am wrong)

Is there a solution for this, i.e to let left click act only as left click and not as any other command? Please help.

Edit: I just restarted the computer. While booting, continuous beeping occurs 15-20 times and then it stops and then windows boots. Looks like some key is stuck (correct me if I am wrong here). Please let me know what to do here.

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