Left click not working ,

It's the Omron microswitches if it just doesn't work and isn't a OS issue :-(. These are from the WinXP/2K era, so they're all at least 15+ years old. You can replace the microswitches (look on eBay, https://www.ebay.com/sch/i.html?_nkw=Mou...) but the reality is the only way to buy them is to buy 10+ to fix a 15+ year old mouse, and the lowest price I found on eBay is $9+ -- yet I can buy the Logitech M100 (or get the B100 picemeal, or in the MK120 combo for $8 more, BUT the B100 is mainly sold B2B as a "bulk buy" mouse for corporate IT teams, online only otherwise) and the retail M100 is $10. For most people, I tell them to get the M100 and consider the $2 differential a convenience tax. People who hoard bulk amounts of their favorite mice? Buy the B100 online, save $2, and use it to buy more later as needed. That said, the B100 ships with the MK120 combo, so if you buy that, you get it for $8 more, since the base keyboard is ~$13 and the MK120 is $20.

As much as I'd love to say "repair this", I can't - the cost of repair for a throwaway mouse with a commodity part (and a ball, so it probably has other wear points like the rollers being aged and worn, along with other issues like the scroll wheel shaft breaking) is way too high. Buy a commodity M100 from your local big box store or Best Buy, and if it makes you feel better, take it to recycling when you do a larger eWaste load. If your mouse is as old as I think it is, you probably have one of the WinXP era Dell keyboards like the SK-8115 - those are workhorses, don't get rid of that. The only keyboards with that type of longevity are Dell's "K120 style" modern boards and Logitech.