System Info: Windows XP MSI P67A-C43 intel i5 2400 4GB DDR3 Western Digital 1TB Hard drive. So I have a very annoying problem with Logitech's SetPoint software that I have been trying to resolve on a customers computer for over a day now. The customer had a logitech Mouse with an Application Switcher button on top, he liked it but the mouse was having issues. He bought a new one from us, M515, and inside SetPoint you can choose the top button's function, so I switched it to Application Switcher and it was suppose to be all good. However, the application crashes with the message "Logitech SetPoint Event Manager (UNICODE) Has encountered a problem..." Now the message seems to appear about 15minutes after the system has been running, I see it appear right after the screen save goes away once I move the mouse, but can also appear while it is use. I have Disabled the AV/Firewall(BitDefender), it didn't seem to show up once it was disabled, I re-enabled it and added the program to the ignore list, allowed it full permissions, added it to exclusion list for On-Access scans and regular scans. I have reinstalled the SetPoint program, after uninstalling I fully removed any left older files/folders and registries There was one suggestion to delete the MacroMail.dll file, tried that, still didn't help. I am at a loss for what could resolve the issue. I must mention that I no longer have the customers computer but am still actively looking for a solution, for now, he can start the program back up from the Icon on the Desktop, but it can get annoying, it should just work. Any suggestions are helpful. I will reply back as soon as I can.