sksdll.dll is a module which is registered as the Backdoor.Haxdoor.G Trojan. This Trojan allows attackers to use your computer as an Internet proxy server.
Non-system processes like sksdll.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