Installed Windows 7 but have no sound.

Everything seems to be working fine after I installed Win 7 on my MBP. I installed the 3.1 update for x32. Any suggestions?
Thanks in advance!

BTW, i saw the earlier post. May MBP is a mid to late 2009.
Model Name: MacBook Pro
Model Identifier: MacBookPro5,5
Processor Name: Intel Core 2 Duo
Processor Speed: 2.26 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP55.00AC.B03
SMC Version (system): 1.47f2
Serial Number (system): WQ9373BX66D
Hardware UUID: 84DA3741-0B85-5107-8281-CE2E623D4A6E
Sudden Motion Sensor:
State: Enabled
Thanks again.
Clay

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