Works & self-installed perfectly on Win7 64. This replaced a 10-yr old Dell mouse, so I'll have to see if I get 10 out of this. I've only had any excessive & problem-free longevity with Dell, HP/Compaq & Microsoft mice & ALL of their hardware.

this mouse is just grate

Did the job for me on an old PC which needed the fitting not found everywhere. Overall pleased with it.