.NET 3.5 SP1 installation failed while working in silent mode and /norestart (random)

I have been struggling with an issue that we have seen our installation fails while installing .net 3.5 SP1 in silent mode (/q /norestart) on a windows 2003 that has .net 3.5.

The error that i have seen in %TEMP%/dd_dotnetfx35error is Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603

while looking on more logs in the temp directory i have seen in %TEMP%/net_framework35_MSI[XXXX] error indicating that System.ServiceModel.Web is locked (inaccessible).

While working with Microsoft support i was told that although using quiet mode with no restart is written as supported it is actually NOT and the temporary documentation i got about it was this – blog post from Aaron Stebner's WebLog :(.

Currently i am trying to reproduce the lock under procmon to see which process actually locks it and waiting for an official KB article saying the above plus a solution for it (that will probably be to extract all the packages from the .net 3.5 SP1 and install manually.

for more info on the location of logs and general installation notes look here

I will update this post after i get final response