soundcard doesn't work

Since I've formatted my harddrive cause I had to much malware on my PC that was impossible to get rid off, my computer doesn't recognize my soundcard anymore.
I've got no idea how to solve this. If I run Everest home I get the following information:

Veld Waarde
CPU Type Intel Pentium 4, 2400 MHz (18 x 133)
Motherboard AOpen AX4G Pro (6 PCI, 1 AGP, 1 CNR, 3 DIMM, Audio, Video, LAN)
Motherboard Chipset Intel Brookdale-G i845G
Systemmemory 247 MB (PC2100 DDR SDRAM)
Soundcard Intel 82801DB ICH4 - AC'97 Audio Controller [A-1]
Harddisc WDC WD400EB-00CPF0 (37 GB, IDE)

I've found the following soundcodecs on my PC:

IMA ADPCM Audio Codec
Microsoft ADPCM Audio Codec
Microsoft CCITT G.711 Audio Codec
DSP Group True Speech (TM) Audio Codec
msg723.acm
Windows Media Audio Codec
Sipro Lab Telecom Audio Codec
Indeo audio software
Fraunhoffer ISS MPEG Layer-3 Codec
Microsoft PCM conversionprogramme

According to everest these are working correctly.
Please help!!!

 

Since reformating have you Re-installed Mobo Drivers and such? If not that would be my first suggestion. Mobo drivers should include the driver and codec for your AC'97 onboard sound.

 

Ok, I've followed your advise and downloades and unzipped realtek343 and 5.00.1012 in a new folder.
I've contacted the helpdesk from Sky (where I've bought my PC) and downloaded rtkaudio_329 as well and I've restarted my PC.
Still it says that my soundcard is not installed correctly.

What else can I try????

 

I love you guys
I'm listening to some nice music now, I just had to find the setup, oops!

Thanx a lot!