I've used AdwCleaner 7.0.2.0 BETA2 on my PC (Windows 10 Pro x64) and I've encountered no problem with (except the alert box about outdated (beta) version you've just to cancel and "Quarantine bug").
Are you sure of integrity of binary file you've downloaded? MD5 checksum correct value for v7.0.2.0 beta2 must be: ce116e89dfb4b0df2a4128b0f8470e36
If the downloaded file is good, perhaps AdwClean...