Windows (a product that you need to buy a license for) has builtin ads. Well, good for MS, I guess...as for me, I'm quite happy that MS has pushed me away from its stack already with Vista: it sure isn't getting any better.
Windows 7 was a perfectly decent OS. In my opinion, the best one they ever made. Rock solid in the end, able to run on anything from ultra low cost embedded stuff to high performance workstations, no ads...
Only thing that bugs me to no end is that they never released a "final" version that has all available security and quality updates included, so one does not need to run Windows Update for hours after a fresh SP1 install (after wasting hours getting WU to run in the first place, it broke thanks to some signature hashing update).
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In your 1st paragraph, you praise Win7 as "rock solid," and in the 2nd, you point out the incredibly lame and showstopping bugs in their SHIT updater which show just how jello solid their OS is. I have the same types of updater issues on Win10 boxes I have to support. I assume that the new clusterfuck will be more of the same.