I am running the latest Win500 program on Win7 pro (64bit) with NO issues what-so-ever (so far).
Just watch the old agressive malicious code/anti-virus/firewall guard dog software. as win500 arrives as a raw exe that does NOT get installed via an installer, the IS software may flag it as malicious, and delete the .exe. Ya gotta give it a rule to allow that seemingly-raw, offending, .exe to run and exist.
Ask me how I know this.....