UpperFilters and LowerFilters are add-ons added by third-party software during installation.
It helps installed programs communicate with your rig (system) drivers.
Sometimes, these filters can cause unit manager errors.
You will have to delete the UpperFilters and LowerFilters registry values from your Windows computer to fix the errors.
UpperFilter’s add-on drivers manage the gadget-access requests from third-party applications.
It then sends the request to the primary unit driver, such as the CD drive, etc.
LowerFilters add-ons work similarly by handling machine access requests from the main driver.
It then sends the request to the kernel driver.
Unfortunately, third-party filters can conflict with the existing machine driver and other software installed on your system.
In most cases, this conflict results in system issues and a unit manager error.
Filters can also corrupt or remain as leftovers after you uninstall applications and prevent the installation of other apps.
While removing the UpperFilters and LowerFilters is relatively easy, you have to be careful while doing it.
Removing incorrect registry values can cause other system issues and sometimes may even require a fresh Windows install.
Before attempting to delete any registry values, confirm tocreate a Windows registry backup.
Also, create a System Restore Point and arecovery drive or system repair disc.
However, the instructions should roughly translate across other versions of the OS, including Windows 8.1 and 7.
Then, reinstall any software that is designed to utilize the removed filters.
If not, you might manually find it in the gadget properties using gadget Manager.
