Change mouse scroll direction in Windows

How to Reverse the mouse scroll direction in windows

 
TL;DR – Run regedit as an admin, search for “FlipFlopWheel” and replace the 0’s with 1’s, unplug and reinsert the mouse.
Step-By-Step.

1. Open Control Panel, double click “Mouse” to open the mouse properties windows, and then click on the “Hardware” tab.
2. Select your mouse in the list of devices then click on the properties button in the bottom right corner, just above the “Apply” and “Help” buttons.
3. In the device properties dialogue window, click on the “Details” tab and then select “Hardwire Ids” from the “Property” drop-down list.  You should see a list of entries starting with “HID…”.  Write down the values that start with “HIDVID_???…”.
4. Close device properties by clicking “Cancel”.
5. Close “Mouse Properties” by clicking “Cancel”.
6. Find and open the application “regedt32.exe” as an administrator, if you are not already logged in as one.
7. Navigate to “HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumHID”, and look for an entry that resembles the “VID_???…” number that you wrote down earlier in step 3.
8. Open each sub entry under your specified “VID_???…” key, and open the “Device Parameters” key.
9. There should be a key named “FlipFlopWheel” under each of the “Device Parameters” key.  Reverse the entry value for the “FlipFlopWheel”.  i.e. if default is “0” (zero) change it to “1”, and vice-versa.
10. Do the same step 9, for each alphanumeric text string key entry, and their “Device Parameters”, “FlipFlopWheel”.
11. Close “regedt32.exe”.
12. Unplug your USB mouse, wait for 5 to 10 seconds, then plug the mouse back in again. If that doesn’t work then reboot.