IDES problem

In my pc ides 4.7 is loaded recently. os is 2003 server. from yesterday i started using internet in my pc. Now while switching on the sap server, yello icon is not turning green. In 'processes list' message server is running green, dispatcher initially turns yellow later won't turns green but turns off. Pls suggest me how to fix this problem? I m using reliance usb modem. It is not properly detected in my pc. Everytime I need to shut down my system to remove usb device. Is XP service pac 2 is better option for internet aswell as sap?