K, I've been using mobile internet. I've got a Huawei E 1820 modem that supports 3G internet. Problem is, I've got thick walls in my room. So, after half a year of enduring 17% internet connectivity (at best), I decided to get myself a USB2 extension cable. I plugged it to my PC and then the other end to my modem. At first it failed to properly detect the hardware but after plugging it into another USB port, everything worked. I placed my modem by my window and finally enjoyed 99% connectivity. Awesome!

But I had some work to do on my PC (I also got myself a new hard drive, 500 gig one you guys helped me find online). I had to unplug everything before installing the new HD of course. When I put everything back together, setup my new Hard drive (formatted it, etc) I tried to go online but found that having plugged the USB extender into a different, port, it was no longer detecting my modem.

I tried every port available... no luck. I get the typical XP USB sound from when something is connecting and disconnecting, but it went on forever, never giving me what I wanted. The modem itself lights up though. I tried unplugging the modem from the cable and then plugging it in again and I get a popup from my task bar saying "USB device malfunctioned and is not recognized by windows".

I tried plugging other USB devices into the extender cables, including USB sticks and they work instantly without any problems. It appears it is just my modem that is acting up. The problem is, I REALLY want to have my modem by the window as it's the only way I'll get a secure connection.

Any idea's on how to get it working again?

I have the latest drivers for my modem, so that's not the issue. I tried that following some guy's advice didn't work. I don't think it is a power issue since the modem worked at first, it just won't work anymore. I've only had this cable for about a day and like I said, everything but the modem works with it.

What's weird is, when I first started having problems with it, the computer kept trying to detect what was on the other end of the cable. Eventually it said "drivers installed" and asked me to restart my PC. Since then, whenever I plug the modem via the USB extension cable, it instantly tells me that the USB device has malfunctioned. It is as if the PC has already decided it won't recognize the Modem plugged via the cable.

The modem didn't come with any cables, this one I bought is the only one I have. It worked fine at first but then windows installed some drivers out of nowhere while trying to detect the cable (after I put the PC back together having installed my new hard drive) and since then, the instant I plug the modem to the cable, I get a message saying that the device has malfunctioned. It doesn't even make the usual sound that a connecting USB device does. It did that before windows installed those drivers so I think it's a windows USB drivers issue. Not the modem drivers since the modem works fine when plugged directly to the PC, just through the cable.

different, port,

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St Nick is my bike thieving buddy brother

That worked when I first plugged it in, but not since.

Alright, here's the update. I uninstalled all USB devices from my PC then rebooted my PC. I left the modem unplugged and let windows automatically install everything else. I then plugged the extension cable and the Modem plugged into it. It didn't detect the device. I tried plugging the cable to another port. It detected my modem BUT I got the blue Screen of death right after.

After windows rebooted I tried loading the device through different ports again. WORKED and without crashing. I was happy... but I knew I'd have to restart eventually. So I restarted my XP. Windows didn't detect anything. Unplugged and replugged = Blue Screen. I tried a few more times, kept crashing.

What is going on?

http://www.usb.org/about/faq/ans5

Performance with a 5m cable is right at the limit of what USB is capable of which will lead to tempermental performance, explaining your issues.