Windows 7 Professional - Reactivation issue

Next issue now is Windows update, that fails with error code: 8024402C
Googling this, it seems that the computer is set to retrieve updates from a server within the company network and not from Microsoft, so the thing is
- The computer is still coupled to the domain of the company from where it was bought
a) will taking the computer out of the domain change the update policies so updates will be taken from Microsoft instead?
b) As computer is managed by the group policies I don't have rights to change update settings, even being administrator of the PC
So I can't change these things directly from control panel

Any good ideas how to fix the update settings so we retrieve updates from Microsoft and not from a private WSUS server.....

NoelDP said:

Unfortunately, the only good way I know to divorce a machine from a domain (which the IT department should have done prior to releasing the machine) is a reformat and reinstall.

The product Key in use now is a COA_SLP Key - as you say, it's apparently properly activated. It's now locked to that motherboard, and cannot be used elsewhere. A reformat/reinstall shouldn't cause problems, if you use that Key together with a Retail disk so long as you first get the necessary drivers from the HP site (for anything that isn't bundled inside Windows 7)
See here for instructions...
Clean Install Windows 7
or
Clean Install : Factory COA Activation Key

OK Thanks, but is there any way to find which .iso file will be the correct one, for the activation key that I have, which should match the windows version installed.... Not sure I understand the difference between all these N, E versions and different license types.....