Vista - Need help with "No Output Audio Device Installed" please!

Hi all!
OK, I'm having many problems getting sound to work again, as well as my Web cam. I have a 1 year old Hp Pavilion DV6748US Laptop that has a Conexant HD Audio. I have Vista Home Premium 32 bit. I have tried and retried just about anything and everything I can find on this subject with no success! I have some other issues going on as well that I will try and explain to the best of my ability. Here goes with all that is wrong:

• my sound randomly comes and goes as it pleases. Sometimes it somes back after waking from sleep mode or restarting. It comes and goes in device manager as well.
• occasionally I will get a a popup that says windows found new hardware-Modem Device On High Definition Audio Bus and when I try and it can't find anything for it, nor can I find anything for it on my computer and get an error code 10. Only when this "windows has found new hardware" is up can I see my audio in device manager with a yellow exclamation point under the video, game etc. and also a yellow exclmation under "other devices".
• In the system tray there will appear "unknown USB Device" and under USB Serial Bus Controllers in Device Manager. Don't know what that is.
• At some point the USB Ports on the left side of my computer didn't work, I don't know if they do at this moment.
• I never tried the web cam until recently and noticed it doesn't work. It also randomly shows up in device manager and quickplay. Don't know if this issue is all related.
• I also noticed that my computer will shutdown/restart in sleep mode as well sometimes.

I have tried to uninstall and reinstall from the Hp website with the drivers etc. several times. I would so appreciate any advice on this issue as I'm about to go crazy!!!!! Please keep in mind that I'm not a computer genius at all, but I'm learning alot so far.

SS

All of the symptoms are almost surely driver issues. The easiest way to resolve them would be to re-install vista. Assuming you dont want to do that I would suggest that in device manager you un-install all the problematic drivers and allow vista to find them for you.

Also you cold chek in event viewer (type event viewer in search) to see if there are any errors relating to the problems.

If you want I can help you work thru the drivers one at a time but un-installng them in one shot would be quicker for you

Ken

Hi Ken,
Thanks so much for responding to my post. I really appreciate it. I would love any and all help I can get on these issues. I checked the Event Log and there are tons and tons of errors just for yesterday alone. I know it's alot to post, but I feel you should see what errors are being reported. Also, I know I need to uninstall all the drivers, but I can't ever find them in device manager. It's very random when they appear and disappear. Here are all the errors being reported. Bare with me because it's alot:

• The network list service service depends on the network location awareness service which failed to start because of the following error: The dependency service or group failed to start.
• The following boot-start or system-start driver(s) failed to load: AFD, DfsC
• The webclient service depends on the webdar client redirector driver service which failed to start because: The dependency service or group failed to start.
• The SMB 2.0 miniredirector service depends on the SMB miniredirector wrapper and engine service which failed to start because: the dependency service or group failed to start.
• The SMB 1x mini redirector service depends on the SMB miniredirector wrapper and engine service and failed to start because: the dependency service or group failed to start.
• The workstation service depends on the network store interface service which failed to start
• the computer browser service depends on the server service which failed to start.
• the network store interface service depends on the NSI proxy service service which failed to start because: a device attched to the system is not functioning.
• the TCP/IP netBIOS helper service depends on the anciliary function driver for winsock service which failed to start because of the following error: a device attached to the system is not functioning.
• the DNS client service depends on the NETIO legacy TDI support driver service which failed to start because: a device attached to the system is not functioning.
• the DHCP client service depends on anciliary function driver for winsock service which failed to start because: device attached is not functioning.
• DCOM got error "1084" attempting to start the service w search with the arguments "" in order to run the server: {9E175B6D-F52A-11D8-B9A5-505054503030}. There are several different ones like this.
• the COM+event+system detected a bad return code during it's internal processing. HRESULT was 8007043c from line 45 of d:\longhorn\com\complus\src\events\tier1\eventsystemobj.cpp. please contact Microsoft support services to report this error.
• DCOM got error "1084" attempting to start the service SHELLHWDetection with arguments "" inorder to run server: more numbers and a bunch more like this.
• The Winlogon notification subscriber <GPClient> was unavailable to handle a notification event.
• the service 'Table Input Service' may not have unregistered for device event notifications before t was stopped.
• WLAN Auto Config Service has successfully stopped.
• WLAN Extensibility Module has stopped. Module path: c:\windows\system 32 bcmihvsry.dll
• windows defender real-time protection agent has detected changes. microsoft recommends you analyze the software that made these changes for potential risks.
• a corrected hardware error occured error source: corrected machine check
• the Quickplay Task Sceduler (QTS) service depends on the Quickplay Background capture service (QBCS) service which failed to start because the service hung in a start-pending state.
• Faulting application HPKBDAPP.exe. version 1.0.0.4
• The MCSTRM service failed to start because it cannot find the file specified.
• The parallel port driver service failed to start due to either it's disabled or because it has no enabled devices associated with it.
• WLAN Extensibility Module has stopped
• a corrected hardware error occured. There are many of these.
• The speed of the processor O is being limited by system firmware. The processor has been in this redused performance state for 18 seconds since the last report.
• faulting application Rox Watch Tray 9.exe, version 9.4.1.2
• A timeout was reached while waiting for the Rox Media DB9 services to connect.

These are all the errors just for August 4th, yesterday. Sorry it's alot, but I hope you can make sense of it all. I can't tell you how much I appreciate you help with this. If anyone else has an opinion please feel free to jump in as well. Thanks again!