I have not read anything about the W32.Blaster.Worm disabling or changing the exe association, but it does make registry changes so it is hard to say what damage it did. Sometimes the cure ( anti-virus software or cleaners ) do more damage then the virus. Some cleaners tend to just delete and remove anything infected. which can lead to all sorts of problems.
First, the whole idea of scanning with the online scanner is to catch something that maybe your Anti-virus software may have missed. Some viruses actually disable your anti-virus software.
Second, there are many different types of anti-virus software and worm cleaners. Some of them like pandas Quick remover are quite good and do not delete the original file. There are others that their idea of a fix is deleting anything infected.
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