Hello and welcome to TSF...
About sound card issue:
It is working well when you run Vista right???
There is incompatibility with Seven I guess...
Visit this Forum, it is about Windows Seven:
http://www.sevenforums.com/
Under driver section you will find how to install Vista drivers for Seven with DriverMAx software, it worked for me...
About corrupted files:
Check what make/model is your HDD, visit manufacturers Web Site, download diagnostic tools and test your HDD for possible bad sectors...
You might have bad HDD...
Keep us posted...