Thank you Joe S but as I said the other PC on the network IS a Win 7 PC and I was streaming stuff to the Xbox. Anyway I figured out what was the problem.
Since my last post I have reinstalled win 7 about 3 times and every time i got the same thing plus other weird stuff like some of the program i have wouldn't install with weird errors, drivers wouldn't work. Well as it turned out, the permissions for all the directories on my comp and additional HDDs were a complete chaos. Add to this the antivirus freshly installed before all the drivers and you have a desaster of a weekend.
What I did to revert everything was copy all the files on my Laptop HDD to external storage and format the laptop hdd partitions then copy back the files (I...