I'm sorry to correct you blue_fyre, but an Avast Repair is the first thing to try. You don't know if it won't work or not until you try. We also need additional information from the OP.
XP Users:
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
- Reboot.
@ xhilmi,
1. What version of Avast did you install?
2. Did you get an error while installing AIS? If so, what did it say?
3. What other security software do you currently have or did you have in the past on these machines 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)?
Let us know how the repair goes when you post your reply to the questions above. Thank you.