I don't know which model you have, but if A11 is the latest, you might consider using it.
If you're still on XP, note that Microsoft is dropping support for that OS within a year and that it is recommended you upgrade to a newer OS (like Windows 7).
I'm unsure as to what the Dell software is used for, but none of my collection of Dell PCs (OptiPlex GX620, Dimension 2350, Dimension 3100 and Vostro 220s) are using it. Then again, they're all configured with Windows 7 or Windows 8.