Windows 7 No internet Access but network connected

Question

Just installed Win7 which was needed for BF3 as i was previously using XP. All was good until my net has just stopped. the LAN icon on the task bar has the yellow symbol with the "!" mark on it.
ive tried unistalling and reinstalling drivers for my NIC. tried resetting my tcp stack, release/renew, dnsflush. have gone through the forums and tried the Bonjour services fix. nothing works. also tried rolling back restore points, no go.
the pc has 2 drives which i switch between, 1 with xp still and 1 with win 7. the xp drives still works no problem and another pc connecting via wi-fi also works just not Win7.
when running the diagnosting tool it keeps coming up with dns not responding
would love some help. this is BS

Answer 1

OK I found the answer! It is a McAfee bug. Go to
http://mvt.mcafee.com. Run Autofix and update the Def file and your done. Wasted too much time on this. I check the Dell Support and they also had this solution.
http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=19&docid=576372&l=en&s=dhs
Thanks for posting this! And get this...just yesterday I received an email (from my working laptop) from McAfee titled "Service Notification: Important Update for your PC". Yea, whatever, I'll get to it later. My desktop hadn't connected to the internet
for a couple of days. Tonight I started troubleshooting and couldn't figure it out. I had network access; my router was giving me an IP and my gateway was my router. But I couldn't ping the router and couldn't get to the internet.
Then I searched and thankfully found your post! As soon as I read it was a McAfee bug I remembered that crucial email! Pasted below is a subset of the entire email, with the relevant portion for those of us who can only access the internet after -rebooting
into 'Safe Mode with Networking':
from: [email protected]
Use this procedure for McAfee Virtual Technician (MVT) to detect and repair the issue. The following steps will repair your product and update your McAfee
software.
Run McAfee Virtual Technician (MVT)
1. Launch your web browser and go to http://mvt.mcafee.com.
2. On the Welcome screen, click Next.
NOTE: The message McAfee
Virtual Technician not found means that MVT is not YET installed on your system. 
3. Click Next again.
4. When you are prompted to save or run the file, click Run.
Click Run a second time
if prompted by the Windows operating system.
NOTE: Windows Vista and 7 users may be prompted to allow the application to run. Click Yes in
the User Account Control dialog if prompted.
5. Click I Agree to
begin the installation.
6. Click Finish to
complete the installation.
7. When the MVT installation completes, click Next to
run the scan.
8. If MVT detects issues with your McAfee software, leave the default optionAutoFix and
click Next. 
If there are no issues, MVT will complete on its own.
9. When MVT and the AutoFix complete, restart your computer.
Ensure the MVT solution worked properly
After your computer restarts please confirm the following:
You should able to access Internet resources by going to familiar web pages.
You should be able to open your McAfee Security software by double-clicking on the M icon in the Windows system tray.
When McAfee SecurityCenter opens, the status bar should be green and state that "Your computer is secure".
While the McAfee SecurityCenter window is still open, you should request and complete an update successfully by doing the following:
1. Click the Updates drawer.
2. Click Check for Updates.
Run a quick scan
After you know that you can access the Internet and your system is protected, perform a quick scan:
1. Open McAfee SecurityCenter by double-clicking on the M icon
in the Windows system tray.
2. Click the Real-Time Scanning drawer.
3. Click the Scan your PC option.
4. Click Run a quick scan.
If you still experience issues, continue to the next Resolution.