What you need to do to fix the Dsound.dll error is Install the latest version of DirectX from Microsoft as described in this FAQ:
http://www.mtu.com/support/faq/faq-h...tm#DSOUNDError
I have never heard of the other Error you are getting, but I bet this will fix it.
Also make sure you have all of the Windows Updates on that computer, from
http://windowsupdate.microsoft.com