I am always very cautious running executables, especially under Windows. Sometimes the antivirus software installed may report supposedly false positives leaving one in a limbo as what to do next, keep installing at risk or avoid the software supposedly reputable and safe.
The best thing is really to get a second opinion but installing a second antivirus software is time consuming and not feasible. The solution is to use an online malware scanner which uses different engines from several software providers that can shed some light on whether the file in question is really malware or simply a false positive from your installed antivirus software.
Two online scanners I use regularly are Virustotal and Jotti’s malware scan, both using several engines to compare against each other. I must admit Virustotal is more sleek and has multi language support, plus it provides extra information about the scanned files.