System errors are any issues or problems your computer system can have. There are a wide array of problems that do not necessarily stem from individual programs, but can be the result of interaction between various programs and your computer. System errors can and does include such things as program crashes, slow computer, illogical error alerts, or issues arising when you update various software programs.
System errors happen for many different reasons, but in most cases are due to miscommunication between your computers operating system and the different programs that you are running on the computer. In most cases, this miscommunication is found in the windows registry, which stores your individual computer settings. When the settings are duplicated, mis-matched, or mislabeled it can bring about host programs becoming disconnected from the resources or applications may not recognize the different types of files that are associated with them.
There are other system errors that are due to driver inconsistencies. These normally happen when hardware drivers are not install correctly and cannot sent the correct signals to the operating system. Generally, the more errors your computer has, the more problems it will have resolving the internal conflicts, which brings on outward signs of destabilization such as slowing down, freezing, crashing, and error alerts.