1. Update the driver of wireless network adapters in both of your computers.
2. Temporarily disable all the firewalls and anti-virus applications, then check the issue again.
3. To exclude the factors from other services and applications, do a clean boot to check the issue and perform Step 4.
(KB929135) How to troubleshoot a problem by performing a clean boot in Windows Vista
http://support.microsoft.com/default.as ... -US;929135
4. With clean boot, try to apply the hotfixes contained in the following KB articles:
(KB932045) Error message when you use a network connection to copy a large file from one Windows Vista-based computer to another Windows Vista-based computer: "The connection has been lost"
http://support.microsoft.com/default.as ... -US;932045
(KB932063) Several problems occur on a Windows Vista-based computer when you work in a wireless network environment
http://support.microsoft.com/default.as ... -US;932063
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