Troubleshoot:After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably.

After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably.

I'm using Win7 Pro on an upgraded XP desktop pc (purchased in early 2006),  with 4gb RAM plenty of room on the c:\drive.
Running Office 2010 and McAFee firewall / antivirus. Everything was working good until I got a Windows update last week and my internet
connection started choking.
Pages won't load unless I repeatedly do a refresh.
Streaming video which used to be a breeze is now running at a crawl.
Forget about watching Netflix the movie will load and after a minute or so, waits hangs in buffer.
My other
pc's in my house that is connected to the same router are aok.
I've updated the firmware on the router, also udpated the desktop drivers for my network adaptor which is a Marvel Yukon.  Did a system restore to before the update and it worked fine.
Then the
update reinstalled itself and the issue persists.
Any ideas?  Thank you.
original title: Win7 sp1 chokes internet connection

Anwsers to the Problem After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably.

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Hi Rafik Cezanne,
Perform the following troubleshooting methods:
Method 1:
I would suggest you to perform the troubleshooting steps and run the Fix it from the following article to disable and enable IPV6 protocols.
How to disable or enable certain Internet Protocol version 6 (IPv6) components in Windows Vista, Windows 7, and Windows Server 2008
Method 2:
I would suggest you to download and install the latest driver for the network adaptor from the following link.
http://www.marvell.com/support/downloads/driverSearchResults.do;jsessionid=Zv6rTnFK7NMsL9GXnZYpBNY5pRDM1wTSS0YY5hrSQn5CPRv7vWkg!1151680137

This particular error can easily be resolved with a few simple steps. However, if you are not confident in your ability to use the methods below or they do not fully remove the issue on your computer, you may want to seek the assistance of a qualified repair technician who is well versed in fixing After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably..

1. Back-up the Registry of your operating system.
2. Find the Registry Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\OSUpgrade]
3. Note: this Registry Key should already exist, if it does not exist, create it.
4. Create a brand new DWORD Value that is named AllowOsUpdate
5. Set the Value to 0x00000001.
6. Close and reopen your Control Panel.
7. Restart the Microsoft Windows.

Another Safe way to Repair the Problem: After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably.:

How to Fix After installing Windows 7 Service Pack 1, my internet connection speed has dropped considerably. with SmartPCFixer?

1. Click the button to download SmartPCFixer . Install it on your system.  Open it, and it will perform a scan for your computer. The errors will be shown in the scan result.

2. After the scan is done, you can see the errors and problems need to be repaired. Click Fix All.

3. The Fixing part is done, the speed of your computer will be much higher than before and the errors have been fixed.

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