Improving audio quality of a wav file

The link says:

Error (429)
This account’s links are generating too much traffic and have been temporarily disabled!


Why is that?
It may not be possible to fix this in post-production. Where possible it is usually better to fix the cause of the problem rather than trying to repair the damage later.

I presume that you are aware of the risks in using Windows XP (Important information for Windows XP users.)