You have several options:
Try a Repair of Avast to see if this fixes your problem:
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
-
Reboot.
If the Repair fails, you need to Uninstall Avast and do a
CLEAN install:
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://files.avast.com/iavs5x/setup_av_free.exe - (multi-language version)
Pro –
http://www.avast.com/pro-antivirus#tab42. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD (it has uninstall tools for both 4.0 and 5.0).
3. Disconnect from the Internet at this time.
4. Go to Control Panel and uninstall Avast through Add/Remove Programs if possible and reboot.
5. If Step 4 fails, boot into
Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool.
You will need to uninstall all versions of Avast at this time.
6.
Reboot.
7. Install the newest version of Avast and
reboot.
8. Get Internet access and register your copy or add the license key for Free, Pro.
9. Update the Avast definitions.
Knowledge based article for uninstall/install of Avast:
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=504#idt_0003If you continue to have problems after the new installation, then we need to look for malware causing your problem:
Check your computer for malware with Malwarebytes’ Anti-Malware (
MBAM).
· Download
free http://www.malwarebytes.org/ (the blue button) for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click
update so you have latest database before scanning.
· Under Settings:
o
General: Automatically Save File After Scan Completes is checked off
o
Scanner Settings:
Check all boxeso
Updater: Download and install update if available is checked off
· Once the program has loaded, select "Perform
FULL Scan", then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the “
remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
·
Copy & Paste the entire report in your next reply.
Try the Repair first and reboot. If this does not work, then do the uninstall/clean install and reboot. If this does not work, then download and run a full MBAM scan and post your log for us to review for malware. Thank you.