Windows 7 Ultimate (64-Bit) fresh install, only WLAN and video driver installed but EXTREMELY slow internet connection...

Question

I recently checked my internet connection on my Asus G53SW and found that it was extremely slow on both the LAN and WLAN connections. I checked with a different laptop (old HP Pavilion) and I get a steady 74mbps+ connection using the same LAN cable and
also with the WLAN connection. My ISP has checked their side and everything is fine.
To try and resolve the issue I tried uninstalling, disabling and tweaking various software and even tried safe mode with networking, all to no avail. I then decided to do a complete fresh install this afternoon. I have installed Windows 7 Ultimate (64 bit)
successfully onto my SSD and everything went smoothly. I have now only installed Nvidia video drivers and the (only) WLAN driver from the Asus support site.
My WLAN connection remains incredibly slow (amost half what it is on the HP and my MacBook Pro). Clearly this is an issue with either the Asus laptop or Windows but I don't know how to proceed in order to eliminate which it could be other than to try a different
o/s to W7-Ult.
Can anyone help who knows more about this than me? Perhaps someone who has had a similar or the same problem because this is giving me a severe headache!
Thanks in advance to all and for any advice.
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Answer 1

Thank you for responding. As I stated in my original post the reason I went through this process was because of an extremely slow internet connection from both the WLAN and LAN connections on my G53SW. At that time I had all of the correct drivers on the
machine. Whilst I would agree that with the machine only having a video and WLAN driver it may well not be working 'optimally', the rationale for doing this was to get the machine working with the minimum of processes to show that it was not anti-virsu software,
Steam or the like causing interference.
I have changed out both of the HDDs this evening (a primary SSD and a secondary 1Tb HDD) for a clean hybrid 1Tb Seagate drive. Once I have installed all of the Asus drivers (and nothing else) I will try the speed test again and report back.
I can now report that with a fresh install of Windows 7 Ultimate SP1 and ONLY Asus drivers as supplied the issue remains. On a connection where I should see around 75mbps I am actually getting around 18mbps, sometimes considerably slower. This only affects
my Asus machine.
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