the current version of PuTTY is trashed by Avast…
PuTTY v0.64 was released on february 28th 2015
(btw, i already submitted this as a false positive report)
avast version: 2015.10.2.2214
virus def version: 150312-0
https://www.virustotal.com/en/file/dc8d3ab6669b0a634de3e48477e7eb1282a770641194de2171ee9f3ec970c088/analysis/1426155320/
virustotal reports my putty.exe to be clean but still it was nuked as Win32:Evo-gen [Susp]
please see attached pic.