Hello gleits and welcome to the forum.
Often times when someone is having difficulty with a security software, it is due to other things. First I need to know the following:
1. What is your OS, 32 or 64-bit?
2. What version of Avast did you install? 5.0.677 is the current version.
3. What other security software do you
currently have or did you have
in the past on this machine including antivirus (AV), firewall (FW), and other security programs? If they were in the past, how did you remove them (the vendor's uninstaller's tool or another way)? You mentioned that you had Avast Free and upgraded to AIS. Anything else? If you did have other security software, see this uninstaller's guide for removal:
http://uninstallers.blogspot.com/.
Here is a knowledge-based article that may also help you with AIS as well:
http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=482&ratingconfirm=1.
Did you reboot after doing your upgrade?
You can try doing an Avast Repair:
- 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 to fix your problem and you had no other security software on your machine in the past to uninstall, then I suggest doing an
uninstall of Avast Free and AIS since both are on your machine, then doing a clean install of AIS:
1. Save a copy of newest version of Avast (5.0.677) for the version you need and save it to your HDD:
AIS –
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 (it has uninstall tools for all products of Avast).
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 Avast Free for the version you used and AIS 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 AIS.
9. Update the Avast definitions.
Let me know if your problem is fixed. Thank you.