I installed Windows 8 Pro 64 bit, now there is no sound.

I have a HP 620 Laptop pc, WZ257UT#ABA. I installed Windows 8 Pro 64 bit, now there is no sound.
I tried all the downloads, including hard reboot. Defaulting bios,etc.
Any possible solutions? I need this going by DEC 24.
Everything else is working fine that I can tell.
Thanks in advance.

More than likely it is a driver compatibility issue with Windows 8.
Did you purchase your notebook before or after October 1, 2011? If you purchased it prior to this date HP will not be producing drivers for the notebook, but the hardware manufacturer may. If the product was purchased after that date you'll just need to watch the product's software and driver page for the drivers to be released.
Here is more information about the upgrade from Windows 7 to Windows 8.
Upgrading from Windows 7 to Windows 8
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I am a volunteer and neither a Lenovo nor a Microsoft employee. • Dexter is a good dog • Dexter je dobrý pes
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Welcome to the Lenovo Community !
Check out the link I have posted below for video driver installation problems on your model. The suggestions offered have worked for others.
http://forums.lenovo.com/t5/Lenovo-C-E-K-M-N-and-V-Series/V570-video-drivers-don-t-work-with-Windows...
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Typing the body of the thread message in the title, huh? -)
I am working on a MacBook Pro (13-inch, Mid 2009) with boot camp running Windows 7 pro 64-bit. Windows crashes quite often now-a-days and I need to get this fixed. I heard that updating boot camp can help. Currently I am running Version 3.0.4 (322).
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Mac 101: Using Windows on your Mac via Boot Camp
https://support.apple.com/kb/HT1461
http://www.apple.com/support/bootcamp/
Helpful Apple Support Resources (Forum Overview)
Boot Camp Support
Boot Camp Manuals
Boot Camp 5.0 Drivers
http://support.apple.com/kb/DL1638
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http://support.apple.com/kb/HT4818
http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.7.pdf
http://manuals.info.apple.com/en/Boot_Camp_Install-Setup_10.6.pdf
http://manuals.info.apple.com/en/Boot_Camp_Install-Setup_10.6.pdfcreate a Windows support software (drivers) CD or USB storage media
http://support.apple.com/kb/HT4407
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https://support.apple.com/kb/HT4569
http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.8.pdf
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Windows 7 FAQ Answers to commonly asked Windows 7 questions.
http://www.apple.com/support/bootcamp/
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http://support.apple.com/kb/DL1638
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I installed Windows 8 Pro 64 bit, now there is no sound.

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