No audio on my Compaq Presario F750EL

Hi everyone, I've some troubles with my audio system.
This morning I was on Youtube watching a video; I closed the page for a while, then I tried to watch again the same video and I didn't get any sound (I tried even with headphones, but I can't still hear a thing).
On my speaker icon there's a red cross, if I put my cursor on it, it says "No AudioDevice Installed".
So, I went to my local support site (I'm Italian) and tried to fix the problem by going on Start>services.msc>Windows Audio>right click, but then I couldn't click on the Start button as I was supposed to.
I then tried to download the driver for my notebook. At first, I let HP check for me if I needed any but then, as it said I didn't, I downloaded myself the only audio driver possible for my version (I checked and put the right operative system).
However, when I try to install the driver, it runs properly until it says that the driver cannot be installed because it can't find the device for this driver.
N.B.: I haven't uninstalled my previous driver and I haven't downloaded any upgrade lately, my audio just switched off for no reason apparently.
Honestly I'm not that good with computers so, please, explain clearly; I also hope that I was enough clear and the terms were right as I translated everything at my best.
Thanks a lot in adance for a quicl response!
Best rgds
My computer is a Compaq Presario F750EL
(http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01366233)
My operative system is Windows Vista 32bit
I downloaded this diriver: Driver Conexant HD-Audio SmartAudio 221
If you need more info tell me.

i did the restore, too, and it didn't work. that's what baffled me! imagine restoring to factory default and the audio still does not work? i must admit that i did download one of the updates and got the audio working. it was temporary because as the Windows Vista updates were being applied, at one point I lost audio again.
i did a bit more research last night and found an interesting post. it requires manually amending some files, so i'm okay to give that a try. as this has been quite the issue to troubleshoot, i will post a solution if I find it. i don't want to settle on this... don't give up!

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