Greentree, almost wasting my time here, fixing this, cos you are running a naked XP there, with no SP2 - how you have survived this long is wondrous.
Do these things.. see what happens:
==Download fixwareout from http://www.bleepingcomputer.com/files/lonny/Fixwareout.exe - and save it to your desktop.
Double click Fixwareout.exe to start the Fixwareout Setup Wizard, click next and then install. Ensure that Run fixit is checked, and click on Finish. After the fix follow the prompts. You will be asked to reboot your computer, and it may take longer than usual to load - this is normal.
Next check some settings....In control panel select the Network and Internet Connections , rclick on your default connection, usually local area connection for cable and dsl, and lclick on properties. Click the Networking tab. Dclick on the Internet Protocol (TCP/IP) item and select Obtain DNS servers automatically. Press OK twice to get out of the properties screen and reboot if it asks.
Now flush the DNS cache: Go Start > Run, type cmd and click OK.
In the command screen, type in cd\ and then press Enter. Now type in ipconfig /flushdns and then Enter. [space after ipconfig]. Type Exit.
FIX CHECKED ENTRIES....!!
Start Hijackthis, do a Scan Only and place checkmarks against all of the following, and then press Fix Checked:
R3 - URLSearchHook: {CF746002-94FB-101B-8C12-02608C454BFF} - - (no file)
O4 - HKLM\..\Run: [SystemOptimizer] rundll32.exe "C:\WINDOWS\System32\aryowyvi.dll",forkonce
O4 - HKCU\..\Run: [ISMModule] "C:\Program …