@
yongsua,
We need to do some trouble-shooting with you to get you back up and running. Did you completely uninstall Comodo with it's uninstaller tool? Sometimes having remnants of prior security software on your machine will cause conflicts and problems with other software.
1.
What other security software do you have on this machine now or in the past? Are MBAM, SAS or Windows Defender (WD) resident on this machine? What other security programs did you have on the machine?
2. Did you uninstall Avast using the Avast uninstaller tool in Safe Mode? Here is the tool:
http://www.avast.com/uninstall-utility and save it to your HDD.
3. When you uninstalled OA, did you "Close and Shut Down OA" via the bottom toolbar pop-up first, then go to Add/Remove Programs...or did you do it in Safe Mode?
It is fine to use Windows FW for now until things get fixed. What version of OA did you have installed?
Is Avast working properly now on this machine? Are you using 5.0.677? If it is not working properly, please try to
Repair Avast:
- Go to Control Panel > Add/Remove programs > Avast Antivirus > Remove.
- Then choose Repair function in the pop-up window (Repair). Reboot.
If the Repair fails, I suggest an uninstall of Avast and a
clean install of Avast:
1. Save a copy of newest version of Avast (5.0.677) for the version you need and save it to your HDD:
Free –
http://www.avast.com/free-antivirus-download#tab4Pro –
http://www.avast.com/pro-antivirus#tab4AIS –
http://files.avast.com/iavs5x/setup_ais.exe2. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD.
3. Disconnect from the Internet at this time.
4. Uninstall Avast through "Add/Remove Programs" through Control Panel if possible.
5. Boot into
Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool.
6.
Reboot twice.
7. Install the newest version of Avast and
reboot.
8. Get Internet access and update Avast definitions.
9. Register your copy or add the license key for Free, Pro, or AIS.
Free –
http://www.avast.com/registration-free-antivirus.phpIf this works for Avast, then I would do a clean install of OA and go through the Safety Check Wizard. OA automatically turns off your Windows FW and vice versa so you always have protection.
Let me know how this works for you. Thank you.