I was having issues with USB flash drives on my laptop. It has been going on for a while, and I had just written it off as crappy drives that weren't happy with my Thinkpad's USB ports. Ok, well, I was delusional. They all worked on my PC, so it was clear that there was something bigger going on.
It turns out there was. The INFCACHE.1 file in my c:\Windows\inf directory was corrupt. Deleting it and letting Windows start from scratch was the key. All better now.
Oh, the symptoms, so searches turn up something useful. Whenever I plugged in a new USB device it would (or at least 90% of the time would) fail to recognize it. Most often this happened for USB flash drives, but only because I wasn't plugging in other stuff that often. Probably the cause of this corruption was the bad RAM I had shortly after purchasing the laptop, but that is truly just a guest. In any event, never fear. Deleting (0r renaming for the weaker sort of Geek) the INFCACHE.1 file should not cause any harm, and will likely help this particular sort of problem.
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