I have been googling and attempting a fix for a while So far I have encountered this problem in
Counter Strike 1.5
All Points Bulletin
In all other situations sound seems to run fine but when any of these app's are running the sound "crashes" after about a minute, by crash I simply mean stops working, there are no error messages and the realtek audio manager remains open however master volume shortcut on the taskbar disappears and appear greyed when accessed via the control panel. I've tried the latest realtek drivers and reverted to most of the latest releases to no avail. Any light on the situation would be extremely helpfull
Windows XP even if it is SP3 installing and uninstalling drivers are not that all easy, If you prefer you can use driver cleaner to wipe the old driver installed then try the new driver for realtek - But then you could also try Tesaga suggestion to upgrade to Windows 7 or Vista.