Suggest use a USB adapter card.
More specifically a PCI USB adapter card.
Dell Support > Inspiron 530 Series Desktop PC > Owner's Manual,http://support.dell.com/support/edocs/systems/inspd530/en/OM/HTML/index.htm
In the list click on - Removing and Installing parts
1) Unplug the computer from power.
[Unplug FROM the surge protector, not the back of the computer. (Power Supply)
Unplugging from the back could lead to a power surge ]
2) Computer on a table open the computer case,
Click on - Removing the Computer Cover - in the list.
3) FOLLOW Anti-Static Precautions
Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware inside the computer.
Computer on a table, computer unplugged from power, computer case open.
TOUCH an unpainted surface, of the metal frame of the open computer case.
This action will relieve your body of Static.
Should you leave your computer in the middle of working on it, be SURE to Touch the metal frame again, upon your return.
Here you see an illustration of your motherboard. Oriented as it is in your computer case. (Just no hardware components, nor cables are attached)
At the bottom of the motherboard are 2 White long expansion slots.
In the illustration they are labeled by the numbers 21 and 22.
If one of these slots is open, and not being used, you can install a PCI USB adapter card.
This is one example of a PCI USB adapter card,http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5606148&Sku=S262-2744
At the back of the computer, located towards the bottom, are the Expansion Slots.
Four horizontal slots.
If there isn't some sort of add-on adapter card already installed, all of the expansion slots will be covered with an Expansion Slot Cover.
If there is an add-on adapter card installed of course, one of the expansion slot covers will be removed.
Line up the PCI USB adapter card with the open PCI slot, you have chosen.
Now look at the expansion slots at the rear of the computer.
Notice what expansion slot that the PCI USB card's bracket, lines up with.
Go to the back of the computer, and view the small metal bracket on the bottom right. Loosen the Thumbscrew, and swing the bracket out. (Thumbscrew is supposed to just loosen, not come out)
Remove the expansion slot cover for your PCI slot choice.
Install the PCI USB adapter card.
Note that there is a Locating Lug in the PCI slot, and a matching Locating Notch, on the PCI USB adapter card.
Line them up, then push the PCI USB card straight down into the PCI slot.
Also watch the metal bracket on the back of the PCI USB card.
The 'tang' at the Bottom, slides down in-between the framework.
The top of the bracket has a half-moon notch, that lines up with a small 'dowel' on the computer case framework.
Make sure it is aligned, and the bracket is aligned.
What I am referring to will become readily apparent, as you go to install the PCI USB card.
If there are any other add-on adapter cards, they may try to fall out, when you go to install the new add-on card.
You just have to line them up, so their bracket notches are all on the 'dowels', and hold them in place. Then swing the 'door' closed. Tighten the thumbscrew.
If you have an Add-on card in the way, and by moving it to the other PCI slot, will allow you to install the PCI USB card, go ahead, and move it.
Doesn't matter. BIOS will find it, and assign an Interrupt Request.
There are two other expansion slots above the 2 white PCI slots.
The expansion slot right above the top PCI slot, is a PCI-Express x1 slot.
If this slot is open, OR the only one available, you can use a PCI-Express USB adapter card.
The last expansion slot you have is above the PCI-Express x1 slot.
This is a PCI-Express x16 slot, and is ONLY used for a graphics card.
For additional questions please post in a Comment.