If you're having problems with wireless networking, it may be because the router or WAP is an older one that is not compatible with the tuning feature in Vista. That happens a lot with public hotspots. If you disable the autotuning feature, you may get better connectivity. Luckily, it's an easy fix:
- Open the command prompt with administrative privileges by right clicking its icon in the Accessories menu and selecting Run As Administrator, or by typing cmd in the Search box and hitting Ctrl+Shift+Enter and responding to the User Account Control dialog box.
- Type: netsh int tcp set global autotuninglevel=disable
- Press ENTER
You have to restart Windows to apply the change.