The file oas.ppl is component of Kaspersky Anti-Virus from Kaspersky Lab. Kaspersky Lab is a Russian company that makes a popular antivirus program.
A problem with this file may mean that your antivirus software is not working properly. You should fix this error immediately, either by reinstalling the software or by cleaning your registry.
The registry is the information desk of your operating system. Windows refers to the registry when you run a program to find the files that belong to that program and how to run them. Errors can creep into the registry during regular use, when you add or remove programs and when certain programs run the registry is edited.
Not all programs do a good job editing the registry, so it sometimes needs to be cleaned. ZookaWare PC Cleaner finds and fixes all the errors in your registry. Use ZookaWare PC Cleaner, the trusted registry cleaner, and keep your registry tidy and correct.