The alert you posted is not from Avast. Instead, it is from Microsoft.
@ CharleyO, Actually the alert is from TuneUp regarding the Performance Optimizer (see top header), then the bottom part directs the OP to the MS site for more information.
@ pain22,
The TuneUp Utility does a lot to mess around with your registry, do fixes without you knowing what it is doing, and many other things. This software reminds me of Advanced_System_Care.
I think you can do better with:
1.
CCleaner - free system optimization, privacy and cleaning tool. There is a
Slim version available as well at
http://www.piriform.com/ccleaner/builds - 4th option down. It removes unused files (cache, temporary Internet files, etc.) from your system, allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. Remember
when installing to uncheck the Yahoo toolbar, the pre-opted in Google toolbar and Chrome as default browser.
2.
Puran Defrag (also has a boot-time defrag)
http://www.puransoftware.com/Puran-Defrag.html - see link for information
Both of the tools I mentioned above do not conflict with Avast.
Please let us know if you have additional questions. Thank you.