Hi guys I've got a good one.
Colleague brought problem to me, as subject says it's an ACER Aspire 9303 (specs here). The user turned it on (hadn't used it since before christmas) and apparently found out that sound not working. I'm led to believe it worked at some point before Christmas. What you get now in the system tray is the equivalent of "no audio mixers installed" (an X across the sound icon).
The user tried restoring to a previous point but apparently didn't help. I tried installing the drivers given on ACER website (Realtek ones) but it has no effect. Nothing happens after computer is restarted. The account is definitely the administrative account. In Device Manager, there is a yellow triangle on the "Microsoft High Definition Audio..." device. That is the only sound device that's shown. When I check the properties on there, there's a Code 37, which apparently means that Windows cannot initialize the device driver. Which gives me the cause, but no fixes. The only fixes I've seen on the internet is when people have that problem with an optical drive.
I should say at this point, there are also yellow triangles on some other items in Device Manager: the display device (NVidia GeForce Go 7200), the two processor cores (AMD Turion 64 X2 TL-52), and a PCI ISA Bridge or something. Last thing I'm gonna try tomorrow (when next I can get access to the laptop) is d/l MBAM and scan for malware.
Oh and for those who are familiar with ACER machines, the Empowering Technology software doesn't work properly either. The bar doesn't have any of the icons in it. I couldn't find where to get it on ACER's website, all I could see was PDFs! Useless!!