Sometimes anti-virus software reports a virus in the PTLens distribution. I have checked the distribution using VirusTotal. This site checks your files with over 40 different anti-virus programs. If only one or two programs report a virus odds are that they are a bit overzealous and are reporting a virus where none actually exists.
Under Windows the files in the PTLens distribution are generated by Microsoft Visual Studio and I scan for viruses on my computer with Avira. With these tools I have determined that a virus does not exist in Visual Studio, does not exist in any utilities or libraries used by Visual Studio, does not exist in any PTLens executables, and in fact does not exist anywhere else on my computer.
Anti-virus software scans files looking for certain bit patterns. When there is a match it reports a virus. Of course it's possible to accidently have the same bit pattern in legitimate software. When a virus is reported, and there really is no virus, this is called false positive. As false positives are reported to the programmers who write anti-virus software they refine their algorithm so that false positives are not generated. If your anti-virus program is indicating there is a virus in PTLens I suggest you report this problem to the programmers who wrote the anti-virus software and be prepared to furnish the file that caused the problem. They are also welcome to contact me via my Feedback page.