Only one mouse button can work

The question is when the mouse left button can work, then there is no reaction
of right click. If the right click is OK, then the left click has no reaction.
(I change the left and right button at Control Panel-->Mouse property page.

I check in th Registry, and find

HKEY_CURRENT_USER\Control Panel\Mouse
MouseThreshold1 "2"
MouseThreshold2 "0"
SwapMouseButtons "1"

Can I modify the item values upper to restore the mouse?
Thanks!

why not just buy a nother mouse?

well...here's my mouse registry keys...you can copy those if you want.

Thank you siyan, your code is helpful!
My mouse is a default generic one, it worked well some days ago before the error occured.
I have tried to change the values under
[HKEY_CURRENT_USER\Control Panel\Mouse], but the problem is still there unsolved.

This is my mouse setting in registry for reference.

[HKEY_CURRENT_USER\Control Panel\Mouse]
"SwapMouseButtons"="1"
"MouseThreshold1"="2"
"MouseThreshold2"="0"
"MouseSpeed"="1"
"DoubleClickSpeed"="421"

SO I will try to install the mouse driver, hope this will work(I think it a software prolem).