kernel32.sys is a malicious file that allows the associated parasite to work as a hidden system process or fake device driver. It can be responsible for implementing main parasite functions and running its destructive payload.
The kernel32.sys file is installed and used by My Security Shield.
In some cases a presence of kernel32.sys does not mean that your system is infected. The file may actually belong to some fully legitimate applications and therefore must stay intact. If you are in doubt, please scan the kernel32.sys file using you regular spyware remover or antivirus program.