No sound in Flash over Citrix connection

Here are some tips that may help: 1) Try uninstalling Flash, logon with a new administrator account that's never been used, switch to install mode (change user /install), install flash, launch and test flash, switch to execute mode (change user /execute). 2) Check that you have 'Enable Sound' on ICA Client and on server-side. 3) Uninstall PSE450R02W2K3040 Windows Update