The z2net.dll file, which may be responsible for creating error messages on some computers, is part of the z2net.dll module. It is currently under review to determine whether or not it could be related to a virus, so a registry scan to fix this file is a very good idea.
One of the most respected sources of registry cleaners is ZookaWare PC Cleaner, a company that is a member of the Better Business Bureau and boasts a track record of fixing registry error messages within one scan. ZookaWare PC Cleaner even guarantees success within 24 hours.
These kinds of error messages are not usually the creation of an inexperienced computer user, nor does it indicate a mistake. Often, the error messages will creep into the system due to the installation or deletion of other, unrelated programs. These actions may delete or overwrite important files for the proper function of a computer, creating an error message. Fortunately, a registry scan can be the answer!