Assuming that your PC port to which this wireless dongle is being connected to is working and supports USB 2, then try a new driver for your USB wireless dongle may solve it! Just find its corresponding manufacturer's website and model no., you may be able to download its latest windows SW driver! However, you should uninstall its existing OLDER diver from Window's Program Un-install Menu first and then reboot Window to clean up its memory footprint. Finally progress to install this new driver and re-configure its wireless's protocol-type, SSID and Password in accordance with your existing router's wireless requirements. Hopefully it will clear it!
Intel E4300 OC with 2GB RAMs,Speedtouch 585 Modem/Router and Windows XP Pro
O2 Standard ADSL2+ Broadband!