We need some more information from you:
1. What is your OS, 32 or 64-bit?
2. What version of Avast did you install?
3. What product of Avast did you install? Free, Pro, AIS?
4. What other security software do you currently have or did you have in the past on this machine including:
- Antivirus (AV)
- 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)?
5. Exactly what kinds of problems are you having with Skype and Avast?
Thank you.