Hey there, I've been having this problem for a long time and finally decided to look for help. Basically, I bought a new USB stick and plugged it in. My computer would search for windows updates, but it would never find the ones required, and the USB wouldn't install. When I unplug the USB and plug it back in again, the computer doesn't even recognize it, and nothing happens.
Currently, my computer is not updated, so that's one thing I won't try. I've installed windows 7 updates numerous times in the past, and every time I did, my computer would have problems starting up (i.e. my desktop would be a black screen when it starts and I can't do anything, or the place where I enter my password to log in doesn't load at all). I'm tired of doing system restores to fix this problem.
Any help is greatly appreciated.