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Hi This can solve also my problem ? Ty
It rather depends if the circumstances, the same avast version/build. But since you are using Avast 9 and XP, your UI will be completely different. I don't believe the option is in the Troubleshooting section, it certainly isn't in my version of avast free 18.5.xxxx and XP Pro SP3.
You would have to try the avast Repair via:
Control Panel > Add Remove programs > Avast Free Antivirus > Change > Repair and reboot after the repair.
If so it certainly won't hurt and is much easier than trying to do a clean reinstall.
One unknown for me would be, since you have a very old version of avast, would the Repair try to repair up to the last supported avast version for XP?Vista 18.8.xxx. That version caused me grief and I had to get back to avast free 18.5.xxxx.