I've got the same problem on my E5550.
There are two drivers that Dell Command Update repeatedly wants to install....
I've installed them manually, and I've removed and re-installed DCU, but these 2 updates keep coming up. No errors are reported by DCU.
This is still a problem, almost a year after the initial post, Dell.
Have the same problem on a Venue Pro 11. Keeps on detecting and installing the Dell Wireless 1537 and Dell 5570 WWAN mobile broadband and GNSS (GPS) driver.