Win32 is the basic interface that the Windows operating system uses to communicate directly with all of the programs that are going to be run in that operating system.
If there was no Win32 function then there would be no communication at all between the programs and the operating system of your computer, which makes Win32 a very important process to have in your computer.
Because this file is so important there have been a lot of malicious programs created that use the same or similar variations, to hide their activities on the system.
One of the most famous examples of this is the Conficker infection. This was at one time the most talked about infections that passed by many computer users faces under the appearance of a Win32 process. The big difference with this infection and the real Win32 is that the program that appears to be Win32 is actually an infection on their machine.
Many malware publishers use the Win32 name to allow their programs to run in the active activities while trying to avoid any suspicion of an infection. If you are experiencing many different pop ups, strange activities, or anything suspicious at all on the system the quickest way to see if there are any obvious infections is to open the task manager and see if there are more than one version of Win32 running. If there is more than one version of Win32 running it would be best to do a full scan of the computer system with an anti-virus and anti-malware program.
Once these scans have completed and removed the infection it is always best to run a full scan with a registry cleaner as this will identify and clean out any remnants of the Win32 viral infections that have been left on the system of in the registry of the computer. If you do not clean out the remnants there are possibilities that the virus will return, or the systems performance could be impacted as there might be excess files in the registry.