The "Acer ePM" (Power Management) program is probably outting your WIFI into hibernation, Make sure it shows the WIFI as on under "Start" "All Programs"
Most Acers use a form of Intel chipped IPN2220 Wireless card. If yours does, you use XP and your router is using WPA or WPA2 (TKIP or AES) security then you'll need to update the driver by searching for it manually using the Custom button (Hardware) in Windows update (instead of Express). This driver is not part of XP service pack 2 or 3. In my experience if you don't update to the newest common form of home wireless security (WPA2 AES) then the older formats seem to become unreliable in the way you describe
Button on the front of the notebook:
Switch on the front of the notebook:
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