Figure out what you will need the card for first, and then research different cards' specs before buying.
But remember it's better to have one that is too good, than not good enough!
a person
The sound card is the first item what you need to check. If have no problem with the card, you need to check the software. And maybe you need check the connection,
A sound card upgrade is not neccessaey when changing your speakers.
You should install the driver for your sound card.
You should check to see if a driver for your sound card has been installed; XP may not have one for your card. You can check this by right-clicking My Computer, selecting Properties, going to the Hardware tab, and launching the Device Manager. If any devices have a yellow question mark, then they do not have a driver installed. You need to find a driver for the card, either on the computer manufacturer's site, or the producer of the sound card (ie. Yamaha, Creative, Intel, etc...).
get a sound card for the computer
The probability is 0.4231, approx.
The probability of selecting a red card is 26 in 52 or 1 in 2. The probability of selecting an even card is 20 in 52 or 5 in 13. The probability, therefore, of selecting a red even card is 1 in 2 times 5 in 13 or 5 in 26.
Only the ones that apply to your sound card.
If you have some basic PC knowledge installing a sound card should be a very simple task.
There are 26 different ways of selecting a black card from a standard deck of 52 cards.
Pass mark sound check