I recently purchased and installed TuneUp utilities software. Since the installation was done, I am no longer able to open my Microsoft Security Essential program and run scans. I attempted to reinstall it, but received the following error code, and I am also unable to download a standard update for my Canon printer. I downloaded and ran the Microsoft Security Scanner, which detected no viruses. Why would I be unable to open my Security Essentials program? Thanks. Gregory Dean

Hi, The TuneUp utilities software would take compatibility issues to your MSE. As this reason, try to do as below link guide: http://answers.microsoft.com/en-us/protect/forum/protect_start/mse-wont-run-error-code-0x4ff02/11432fa4-bb83-4e72-a74e-7c5737dfc59b