Hi Antony,
Thank you for posting your question on Microsoft Community!
After going through your description, it appears that you have an issue with intermittent in the Internet connection. However, in order to guide you in the right direction; I will need some more information. Please help me by answering the questions mentioned below.
1. Did you make any changes to the computer prior to this issue?
2. Are you using wired or wireless network?
Check if you can experience the issue in ‘Safe mode with networking’; if safe mode with networking works fine then set the computer to ‘Clean boot’ state to check for software conflicts.
Step 1:
Start your computer in safe mode with networking.
http://windows.microsoft.com/en-US/windows7/Advanced-startup-options-including-safe-mode
Step 2:
Keep the computer on a clean boot and check for the issue status.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7.
http://support.microsoft.com/kb/929135
Note: Please go through step 3 of the Kb to keep the computer in normal startup after fixing the issue.
You can also refer to:
Error 101 (net::ERR_CONNECTION_RESET): The connection was reset.
Please update more information after trying the above mentioned steps; it would help us to troubleshoot the issue. Please do let us know if you need any help with Windows, we’ll be happy to assist you!