xmicrowlan.exe is a IEEE 802.11b Wireless LAN Utility (Unicode)
belonging to IEEE 802.11b+g Wireless LAN Utility
Non-system processes like xmicrowlan.exe 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.