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Connectivity and Performance Problem in Mobile PC to Wireless Access Point
http://www.vistaarticles.com/articles/230/1/Connectivity-and-Performance-Problem-in-Mobile-PC-to-Wireless-Access-Point
By 
Published on 12/10/2006
 
You may experience random connectivity issues.

Connectivity and Performance Problem in Mobile PC to Wireless Access Point

Method 1: Connect the mobile PC to a power source
When you plug the mobile PC into a power source, Windows Vista switches the wireless network adapter power setting in the default power plan from the Medium Power Save setting to the Maximum Performance setting. This turns off the 802.11 power save mode.

Method 2: Modify the default power saving power plan
Modify the default on-battery power setting for the wireless network adapter. Configure the wireless network adapter to use the Maximum Performance setting when Windows Vista is configured to use the Balanced power plan or the Power saver power plan. To do this, follow these steps:1. Click Start, type Power Options in the Start Search box, and then click Power Options in the Programs list.

 If you are prompted for an administrator password or confirmation, type your password or click Continue. 
2. Click Change plan settings under the power plan that is selected. For example, if the Balanced option is selected, click Change plan settings under Balanced.
3. Click Change advanced power settings.
4. In the Power Options dialog box, expand Wireless Adapter Settings, and then expand Power Saving Mode.
5. In the list that appears next to On battery, click Maximum Performance, and then click OK.

Method 3: Use the "High performance" power plan
If the computer is running on a power plan other than the High performance power plan when you connect to a wireless network, manually change the power plan to High performance. To do this, follow these steps:1. Click Start, type Power Options in the Start Search box, and then click Power Options in the Programs list.

 If you are prompted for an administrator password or confirmation, type your password or click Continue.

Note You can also right-click the battery icon in the notification area to access the Power Options command. 
2. Click High performance.