Last post before you go on the foe list, but just re-read the thread and you'll see it was caused by downloading a large torrent; utorrent, by default attempts to cache the data, but a bug in both bittorrent and utorrent causes the disk to overload significantly slowing down the disk write speed which curbs the download speed to the speed the disk can write at. Disabling the cache resolves the issue and, as the op confirmed, the issue is now resolved without the need to replace the microfilters.
Had your advice been followed the op could have been compelled to purchase new microfilters to only be greeted with the same problem.
Had the microfilters been to blame the attenuation would have reached a level where the connection constantly dropped, not reducing the download speed to 150kbps.
ps, I labelled you a narcissist not as an insult but because you portray all the signs at a level I've never seen before, you need to seek help.