In Windows Vista the networking components were designed to be much more intelligent and automatically adjust the network settings to optimize the connection speed. This is a great new feature. Your network components basically tweak themselves for optimal performance. In most situations, these components automatically adjust perfectly for best performance. However, with wireless WAN cards the detection of network conditions is flawed and can result in slower network performance.
To fix this problem, Microsoft has released a hotfix for users affected by this issue. If you have a Wireless WAN device, I suggest you give this hotfix a try.
KB 940646 details:
This problem occurs because of the way that TCP receive window auto tuning is used in Windows Vista for connections that only receive data.
Windows Vista obtains a round-trip time (RTT) estimate at the time of connection setup and every time that a new segment of data that is transmitted. A connection that only receives data is limited to the single RTT sample that is obtained at the time of connection setup. Because the connection only receives data, the connection cannot “converge” to the actual RTT of the connection. For example, because the RTT data may fluctuate for various reasons, a “converge” operation is performed to estimate a meaningful RTT by using blending current and previous RTT data. However, if the connection cannot converge to the actual RTT of the connection, the bandwidth delay product (BDP) estimate that Vista obtains is also incorrect. Therefore, the connection’s receive window is limited, and throughput of the connected transmission network is reduced.
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Watch out for a fictitious Microsoft Security Center Alert of
“… Warning firewall blah blah blah has detected trojan.zlob on your computer. Click here to enable protection”
This is a rogue spyware extorting people to buy Antivirus 2009!
Whatever you do, DO NOT CLICK ANYTHING!!!
This is a very difficult virus to get rid of and none of the anti-virus or spyware programs will remove this automatically. You will have to manually remove it. Below are the instructions.
This solution works for the latest Trojan.Zlog.G popup problem where no internet connection works and repeated fake warnings to ‘activate’ Defender anti-virus program. Make sure you check out This Page for the best in free anti-virus software.
No use running any anti-virus/soyware programs, they don’t seem to detect this latest Trojan. Only manual removal works perfect:
Make sure you have system restore turned off!
Start in safe mode (press F8 at startup)
Delete following:
kjzna1562565.exe
spcffwl.dll
T-Scan (entire folder)
Their location would be C:\Documents and Settings\{username}\Application Data\Google\
Leave us comments if you have any questions and we will get back with you. Good luck!
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