Answer by Serdalis for Device misdetected as serial mouse

I just encountered this problem myself on Windows 7 Professional x64, and a solution that worked for me was to go into the registry and edit the following value:

Location: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\sermouse  Key: Start  Value: 3

Change Value to 4 and it will stop this problem occurring.

Here is a list of all valid Start values:

0 Boot (loaded by kernel loader). Components of the driver stack for the boot (startup) volume must be loaded by the kernel loader.1 System (loaded by I/O subsystem). Specifies that the driver is loaded at kernel initialization.2 Automatic (loaded by Service Control Manager). Specifies that the service is loaded or started automatically.3 Manual. Specifies that the service does not start until the user starts it manually, such as by using Device Manager.4 Disabled. Specifies that the service should not be started.

A reg edit command would be as follows:

REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\sermouse" /V Start /T REG_DWORD /F /D 4

You then need to restart the computer, which should now start correctly and not attempt to discover a serial mouse.

good luck.