When Chrome installs updates it retains (just one?) previous version of the program. When the update is for a security patch, Secunia’s PSI complains about the presence of this old, insecure version of the application being on my system. This used to happen with Java as well, but in that case there was an entry for in the “Programs and Features” Control Panel for each version that allowed the old versions to be uninstalled. That is not the case for Chrome.
I have just been deleting the directory containing the old version of Chrome. Is there a better option? Is there any reason or any risk in leaving it lying around?