EW-7326Ig PCI Adapter slow signal/speed - Windows 7 x64 Ultimate

Hello !
Today i've tried to switch a (Edimax) EW-7326Ig PCI Adapter from my old IBM computer to a new PC .

After few minutes I managed to get my PCI Adapter from a computer to another .

Now I installed a TP-LINK (TL-WN353G_WN353GD) Driver to get the wireless up and running .

The problem is that on the IBM computer i had the same driver it installed and it worked with a good speed and signal ( 350 Kb/s and 60-70% signal ) and if I try to connect from my new PC to wireless the signal si very poor and the speed is very slow ( 5-10 Kb/s 10-20% signal ) .

So what am I doing wrong ? When i installed the PCI Adapter driver i made the same steps as on the IBM computer .

Anybody knows any fix for this ?

Other specifications :

On the old computer : (IBM) i use Windows XP sp1
On the new PC : i use Windows 7 x64 ultimate edition

The (Edimax) PCI Adapter supports up to 54 Mb/s and a codification of 64/128 - bit WEP , WPA i WPA 2

Can anyone help me ?

Are you sure you are using the right driver for the windows 7 version? That's where I'd start looking into first.

http://www.tp-link.com/en/support/download/

Ok , let me tell you .

I have the PCI Driver's box and on it are mentioned all OS but Windows 7 isn't there .

It's like this : Microsoft windows 9x , 2000 , Me , XP and Vista .

On the other side of the box are mentioned only Vista and Mac in circles .

The problem is that i don't know which driver i must take from tp-link.com because write my PCI Adapter in the search box ( EW-7326Ig ) and I don't find any results to get the latest driver .

Any help?

The old driver that I have is both for windos 7 and Xp ( 2 different setup.exe )

And if I download a TP-LINK Driver from their official site it gives me only a router driver but I have a PCI Adapter not a Router