Deleting Flash10a.ocx after uninstalling / updating ActiveX Flash

When updating Flash it sometimes leaves some files behind you cannot delete, even though there is no lock on the file (handle, unlocker, whatever).

You need to unregister it using regsvr32:

regsvr32 "C:\Windows\SYSTEM32\Macromed\Flash\Flash10a.ocx" /u

Now you can update your Flash...