Hi Padd There is a item in this link: http://www.amazon.com/Cable-Matters-SuperSpeed-Micro-B-Black/dp/B00CFLNUAE/ref=pd_bxgy_147_img_2?ie=UTF8&refRID=10NAE1W08KAFB22V64FJ

Looks like the router was broken, you may ask a replacement if the product still in Warranty.

Looks like Archer T4U does not support Win vista.

Note: Does not require drivers for Windows 10/ 8.1 / 8 / 7 / Vista / XP or Mac OS X and Linux systems. Backward compatible with USB 2.0/1.1 and the actual transmission speed is limited by the setting...

I think you'd better go the http://ticket.tp-link.com/ and tell the specific to them.

Looks like it does make limit on firmware.