WLAN Optimizer is actually a small free software utility for Windows (Vista / Windows 7/ Windows 8 / Windows 10). It improves the latency time of most wireless connections. Thus it's really useful for those with slow wireless connections experiencing lag spikes (particularly during internet gaming, video and audio streaming). The program works by automatically scheduling background network scanning on your PC. It basically filters out all unwanted or redundant signals that cause your system to lose connection.
WLAN Optimizer also fixes some of the more commonly reported network issues such as Windows Update not working, multiple Bluetooth devices not being detected etc. This program is extremely popular because it has the ability to fix the most problems that occur with the Windows networking services. So basically what this program does is it scans your system, disables any of the unnecessary drivers that are installed and then patches the missing security updates from Microsoft.
There are a lot of other things that you can do with WLAN Optimizer, it works great with other software such as IE and Firefox as well. If you want to disable the program, there are two ways by which you can do it. One by manually removing all the files from your computer where the optimizer files are located (not recommended) or by using registry cleaning software to delete them.