Vista - Just upgraded to Vista Premium (help)

This is my first post here so I do hope its in the right place,
Yesterday I upgraded my other desktop to vista premium,all has gone ok except I cannot get the sound to work.I have used the troubleshoot etc assuming it might be a driver issue and have updated existing drivers.I keep getting the message this device is working correctly.
I may be out of my depth here but went ahead with the install anyway.
I have just seen that on the c drive the fold entitled "Old" is there and when I look the Realtek and items are here.is there anyway I can restore these to enable my sound to return.

Sorry if its a bit non technical but its the only way I can put the problem

First thing, i cant help you with reloading drivers If I dont know what system/model you have. List that and I will gve you the drivers to reinstall. Vista will install most, but there are a few you should re-install

First thing you need to do is go to Windows updates and click "check for updates", download, and Install any updates to your system, and keep going back after restarts until It says "Windows is up to date- no updates are available for your computer"
Then we will download and re-install the drivers (including sound) for your system.

Thank you its a PB 500
Motherboard NEC GA 8TRC41OM NF

Hope this helps and thanks again

Here are your specs for (GA-8TRC410MNF-RH) MoBo

Support
Intel Pentium D Dual Core Technology
Intel® Pentium® Hyper-Threading Technology (HT Technology) with FMB Performance 2005 support
Intel® Pentium® 4 processor in an LGA775 socket with an 800 MHz bus, 2.8Ghz to 3.8 GHz or higher
Intel® Celeron® (D) processor in an LGA775 socket with a 533 MHz system bus, 2.8 GHz or higher
Chipset
ATI Radeon Xpress 200 Intel Edition Chipset with Integrated Graphics Processor
System Memory
DDR2 400 / DDR2533 / DDR2 667, 2 banks
Support for up to 4 GB system memory
Expansion Slots
1x PCI Express 16X
1x PCI Express 1X
2x PCI
Ethernet Controller
LAN 10/100 (Realtek RTL8100C)
FireWire (IEEE 1394) Controller
VIA VT6307 IEEE 1394 controller
Audio
Intel® High Definition Audio subsystem using the Realtek ALC880 audio codec
IDE (HDD, ODD)
4 x SATA connectors
1 x Ultra ATA-133 connector

Thats the one.I am just running the update driver now

Before you install these Update Windows- then after re-installing these driver/software packages check device manager for yellow exclaimation marks for missing drivers, and we will go from there.

Realtek ALC 880 HD audio codec/driver (sound driver & Audio Manager):
Realtek

Full software Suite ATI Radeon Xpress 200 (Graphics driver):
ATI Catalystâ„¢ Display Driver

Yes I have followed all this and have the yellow triangle showing code 43

On what device? and are you now running a fully updated SP1?

Its showing it on Radion Express 200
Yes fully updated SP1

Try uninstalling, restart, and re-install the Catalyst package I linked