I have this same problem when updating to V. 4.0. I use Windows 7 on a 64-bit system. Does this fix still apply? Windows says my sound driver (RealTek 6.0) is installed, but NONE of my programs recognize it now, including Windows Media Player and internet sites like YouTube. The message is: 152413 - SoundTap could not connect to the filter driver. If you have not restarted your computer since installing SoundTap, you will need to do so now. This isn't the first time I've had this problem updating SoundTap only to find it doesn't connect to my driver, but it is the first time I don't seem to be able to fix it. This is an unbelievable annoying problem with SoundTap and apparently, I'm not the only one. You should REALLY fix this problem in time for the next version of SoundTap. Thanks.