Thanks for the welcomes, Tech..
I think I have another problem... I just did a full boot scan and then some files cannot be scanned, so I sent those files to the Chest (not one of the System 32 files..).. In the Chest, I scanned the files, it found no viruses, and then I restored the files... What's weird is that when I selected all files and clicked restore, it says it successfully restored the files but the files are still in the Chest.. What to do now..?
And the application which Avast could not scan the files is alright.. Is it now safe to delete those files..?