You cannot have 2 antivirus (AV) software on your machine at the same time or this will create all kinds of problems and may prevent another AV from working properly. The fact that you still have an old AV on your machine is now creating problems for Avast, so you need to uninstall the Defender Pro.
Defender Pro actually is Kaspersky Security rebranded and sold in a package with some junk utilities. Kaspersky's removal tool is even one of the solutions suggested by Defender Pro support to deal with this kind of situation.
1. Please run the Kaspersky’s Uninstaller Tools:
http://support.kaspersky.co/faq/?qid=208279463, then reboot your machine.
2. If you have problems with Avast after this, then run the Avast Repair:
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
- Reboot.
3. If the Avast Repair does not fix your problem, then you may need to uninstall and do a clean install of Avast using Avast's Uninstaller Tool
http://files.avast.com/files/eng/aswclear6.exe.
Let us know how you do.
In your next post, let us know the following:
A. What version of Avast did you install?
B. What product of Avast did you install? Free, Pro, AIS?
C. What other security software do you
currently have or did you have
in the past on this machine including:
- Firewall (FW)
- Trial versions of AV, FW and other security programs
- Other security software
- If they were in the past, how did you remove them (the vendor's uninstaller's tool or another way)?
Thank you.