system
10
Is Avast being recognized by your Action Security Center?
Have you checked for malware?
Is your machine acting normally?
Here are the download files to v.889 assuming your uninstalled MSE:
Free: http://files.avast.com/iavs5x/setup_av_free.exe
Pro: http://files.avast.com/iavs5x/setup_av_pro.exe
AIS: http://files.avast.com/iavs5x/setup_ais.exe
Let me know how this works for you. Thank you.