winlogin.exe is added to the system as a result of the RANDEX.E virus. It is an IRC Trojan horse gives remote access to your computer using IRC. This process is a security risk and should be removed from your system. If found on your system make sure that you have downloaded the latest update for your antivirus application.
Non-system processes like winlogin.exe originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.

In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the RANDEX.E virus process. To access the Task Manager, hold down the Ctrl + Shift + Esc keys at the same time. These three buttons are located on the far left of your keyboard.

Warning! winlogin.exe is considered to be a dangerous process and should be removed. Running issues with this process can increase the risk of malware infection if bugs are present. Scan your system with an anti-malware software to identify unused processes and services that can be safely removed.

This process is not considered CPU intensive. However, running too many processes on your system may affect your PC’s performance. To reduce system overload, you can use the Microsoft System Configuration Utility (MSConfig) or the Windows Task Manager to manually find and disable processes that launch upon start-up.

Use the Windows Resource Monitor to find out which processes and applications write/read the most on the hard drive, send the most data to the Internet, or use the most memory. To access the Resource Monitor, press the key combination Windows key + R and then enter 'resmon'.