Correct nothing really obvious that would be preventing the built-in audio.
I would download and install this update and after a reboot go back to Windows Updates and look for any other critical updates.
Microsoft Visual C++ 2005 SP1 Redistributable Package (x86)
I don't think it is any corruption as they say, I think that is just more so a generic error.
Before doing the Windows update though I think you should perform this clean up to ensure that there is not something else on your system.
If you're 100% certain your box is clean then we can skip this part, but if it turns out later on that it is because of temp files or malware and you skipped it then we won't be too happy about that.
You have to realize that we don't know the details of your computer, or your computer knowledge and that's why we need to rule things out first and get back to a basic starting point.
So did you download and install the Audio software from DELL and have it install without error?
- Follow these instructions carefully.
- Download ATF-Cleaner from Snapfiles.com to remove "junk" files from your computer that may contain malware.
- You can also download it from Majorgeeks.com
- When you run ATF-Cleaner, check the items as shown below for Main.
- For FireFox, be sure to click on the FireFox tab on top and check the items as shown below for FireFox
- NOTE: If you don't have FireFox or Opera installed then they will be grayed out and can be ignored
- Then click on "Empty Selected".

.
- ----------------------------------------------------------------------
- Install and run the free version (not the Professional version) of SUPERAntiSpyware from SUPERAntiSpyware.com - AntiAdware, AntiSpyware, AntiMalware!
- Accept any prompts to allow SUPERAntiSpyware to install the latest rules and infection definition files.
- You do not have to send them your e-mail address, just click next.
- You can leave the automated check for updates on.
- You can uncheck "Send a diagnostic report to research center" if you don't want to send the information.
- DO NOT allow SUPERAntiSpyware to protect your Home Page settings.
- On the Top Left select the Scan your computer button.
- Make sure there is a CHECK MARK on all Fixed Drives.
- Click "Perform a Complete Scan". Click "Next" and reboot the computer when prompted to do so.