Try disabling Task Offload. Go to Device Manager, and properties, than Advanced, and turn Task Offload off.
Windows 7 Internet Drops Out Randomly: Fix
19 August 2009 @ 9amSeveral users have reported an issue in which Windows 7 Internet (network) connections die or drop out randomly during routine use. This can cause Web browsers to suddenly stop loading pages; network drives to disappear; and other network-enabled applications to lose functionality. The problem may be especially prominent with the Atheros L1 Gigabit Ethernet 10/100/1000Base-T Controller used on Asus p5k motherboards. There are two potential fixes for this issue:
Fixes
Install a new driver This driver (FTP Link), intended for Windows Vista, has been reported to solve this issue under Windows 7 in a variety of cases.
Use a new network card Unfortunately, if the aforementioned fix does not work, you may need to use a different network card (NIC). The Dynex DX-PCIGB, available for roughly $30 from Best Buy, has been reported to work well under Windows 7.
Tagged
Windows 7
I had the exact same issue on my Windows 7 64 bit install. After hours of searching to see what was causing the issue, I found that Windows Security Essentials was the problem.
Internet started working normal again after disabling realtime protection. Since my internet worked just fine after just installing Windows 7, it’s probably some update to security essentials that messed some things up.
Let me know if this solves your issues…
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