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Anyway, now the registry editor is saying that i have a file which is a non-registered script (a virus) and i cannot repair or import it to the safe box (sorry again forgot the correct name of this).

I would suggest running the registry editor (which is ?) for more information as it is impossibly to speculate, well not impossible, but not with any possible accuracy.

What is your OS ?

When you get a problem as you have, where you are unable to repair (not always possible, see below) or move to the chest (usually because the file is in use), then you could try scheduling a boot-time scan. This runs before windows starts so should get round that problem and allow you to send to the chest.

If you have XP, vista32bit or Win2k, you could enable a boot time scan. Right click the avast icon, select Start avast! Antivirus, Menu, ‘Schedule boot-time scan…’ Or see http://www.digitalred.com/avast-boot-time.php.

Repair:
Trojans generally can’t be repaired (either by the VRDB or avast virus cleaner), because the entire content of the file is malware, so it is either move to chest or delete, move to the chest being the best option (first do no harm). When a file is in the chest it can’t do any harm and you can investigate the infected warning.

The VRDB only protects certain files, mainly .exe files, it doesn’t protect data files or all files, it is not a back-up program, so there are going to be many occasions where repair won’t be an option.
Only true virus infection can be repaired, e.g. when a virus infects a file it adds a small part to it, provided that file is one that avast’s VRDB would monitor and you have run the VRDB, then it may be possible to repair the file to its uninfected state.
However, for the most part so called viruses, trojans (adware/spyware/malware, etc.) can’t be repaired because the complete content of the file is malicious.