skype_toolbar.dll is a Skype IE Toolbar
belonging to Skype for Internet Explorer
from Skype Technologies S.A.
Non-system processes like skype_toolbar.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.