Sorry for taking so long to reply. I've had a lot on my plate lately.
Did you update the sound card's driver? It might just be outdated since you mentioned coming from XP and since it happened at such a specific moment and you don't seem to have done anything to it physically I doubt it's a hardware problem.
This might be of use: http://windows.microsoft.com/en-us/windows/no-sound-help#no-sound=windows-7&v1h=win8tab4&v2h=win7tab1&v3h=winvistatab1&v4h=winxptab1
Tried the methods described in the tutorial, didn't have any luck unfortunately.
99.9% chance it is just a driver issue, not a hardware issue, like Silent K said. The 'X-Blade' bit is just the case– I've seen cases like that before, pretty typical gamer looking case with flashy lights everywhere-- and unfortunately case information rarely helps unless it is a brand name, like Dell/HP/Lenovo. If you still haven't resolved this via Microsoft Update or the troubleshooter Silent K linked to, then in order to fix the issue you need to identify what sound card you have. First, is it a physical add-on card that was put in to the computer, or is it an integrated card that came as a part of the motherboard. The way you tell is if the cables for your speakers or headphones plug in to the back of the computer next to the USB, network, and other ports [[URL="http://www.overclock3d.net/gfx/articles/2007/07/25214418871l.jpg"]like this] then it is integrated; if they plug in to their own separate slot [[URL="http://vibrotoolbox.sourceforge.net/manbasic/fig/soundcard_back.jpg"]like this] then it is an add-on or dedicated card.
Depending on what type it is, the method to obtain the driver can vary. Sound drivers tend to be the less descriptive and most difficult to resolve in the device manager, which doesn't help.
Unfortunately I'm not sure of specifics when it comes to the computer model, as it was purchased by and later given to us by a family friend. I do know that he bought it through tigerdirect.com and it's distributed by Visionman computer systems. That's unfortunately as far as my knowledge on it goes.
They plug into an integrated port, that being said, what should I do in regards to solving it?
EDIT Woah shit, nevermind. Finally got it to work! Thanks guys!