SORRY GUYS, SOMETHING SEEMS TO BE WRONG WITH MY OTHER TOPIC AND IT IS NOT DISPLAYING CORRECTLY. PLEASE REMOVE IF POSSIBLE.

I just got a really small usb wlan adaptor off ebay for my 64bit version of windows, because my old adapter doesn't work on 64bit.
The seller told me it runs with a RTL8188SU driver, which I got from realtek, installed and got working.
The problem is, it is EXTREMELY slow, it's not even funny.
I did a Telecom speed test and after a long time, it measured 4KBs.
Plugged my old wlan adaptor back and dual booted the 32bit back, and it reads 435KBs.

Here are the specs:
Features:

    * Support IEEE 802.11n
    * Support IEEE 802.11b and IEEE 802.11g standard
    * USB 2.0 interface
    * Mini-Size

Specification:
Wifi Standards :    IEEE 802.11b/g/n    Interface :     USB 2.0
Drivers Included :    Yes, Driver CD included**    Frequency Band :    2.4GHz ISM Band*
Modulation Method :     BPSK / QPSK / 16-QAM / 64-QAM    Security Mode :     WEP, TKIP, AES, WPA and WPA2
Bandwidth :    40MHz for 150Mbps
20MHz for 72.2Mbps    Supporting OS:    Windows XP / Vista / Win 7
Mac OS 10.4 / 10.5 / 10.6
Linux
Data Rate :    IEEE 802.11n 150Mbps (Max)
IEEE 802.11g 54Mbps (Max)
IEEE 802.11b 11Mbps (Max)    Transmitter Power :     IEEE 802.11n: 14 dBm (Max)
IEEE 802.11g: 14 dBm (Max)
IEEE 802.11b: 17 dBm (Max)
* NOT support 5GHz Frequency Band
** Updated drivers can also be downloaded separately

So it is supposed to be this slow or am I doing something wrong?
What should I look for when buying a new one?
Thanks in advance!