Dell System Software Win7 64 german

I just bought a Precision M4500, Win7 64 bit, and installed the DSS version 7.01, A01 which I downloaded from the Dell support marked as "urgent". But I wonder if it actually works for two reasons:

1. I ran the installer a second time, the installer stated that the DSS does NOT exist so I installed it another time, the installer still cannot find it.

I installed it both ways
- DELL_SYSTEM-SOFTWARE_A01_R260746.exe
- DSS_UTIL_WIN_R260746.EXE

The installer still cannot find it.

2. In the registry, I do find a few KB Patches listed here:
HKLM/Software/Dell/System Software/7.0.1,
e.g. the KB974476-v2-x64.msu

Well, when I then ran my first MS Update, the KB974476 did'nt show up! Windows "Installed patches" does not list it, I cannot find it anywhere in the system.

So I really wonder whether or not DSS works correctly, or even if it is installed correctly. How could I verify this? Is there a GUI, a software, a service or just plain registry keys), is the list of patches a list of required or installed patches, which program actually downloads / installs it, how can I verify successful installation.

Thx very much in advance
Marc