Was the same issue: could not connect to htc sync (the phone wrote that there is no htc sync software on PC).
The PROBLEM was about firewall.
1. just exit your firewall;
2. need to set off USB debugging on the device;
3. set ON again the USB debugging on the device and wait few seconds - device will be recognized by the htc sync.
For me the problem was resolved. After that I just checked the firewall settings in detail and found where the issue was.
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