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I'm here because I just experienced this problem this evening, except I'm using Windows 10 on Parallels 11.2.3 (32663). Thankfully, DonA2's...
4+ years later and your solution, Ben, still works for someone who just encountered this problem after updating to Windows 7 (from XP) and...
Me too I started using Parallels on my iMac i7 about a month ago. Noticed the same problem soon later and connected the dots about ten days ago....