Can someone direct me in the RIGHT direction???

I have a Windows XP and it is homebuilt. I now have no sound and was attacked by Bravesentry Trojan Just before I lost the sound. Windows was already installed before loss of sound.
I checked the folder and it says that there is no audio device. I went into properties and checked all the items in there and all of them say that they are working ok. BUT the puter can't find the device.
I have tried to reinstall drivers and still no sound.
I have: ATI technologies 30 RAGEPro AGP 2X; Intel (r) 83271AB/EB PCI Bus Master IDE Controller; 3Com Etherlink 10/100 PCI TX NIC(3C905B-TX); Intel(r) 82371AB/EB PCI to USB Universal Host Controller;Audio Codecs; Legacy Audio Drivers; ES1869 control Interface (WDM); ES1869 Plug and Play Audio Drive (WDM). I hope that helps you in some way! I sure can use the help!!!
Thank you!