I’m going to need a little more information before I can diagnose this issue.
1. Could you please be more specific when you say it “freezes.” Does the interface show? Does Windows mark the application as Not Responding?
2. Did this happen with previous versions of System Ninja, or just 3.2.1?
3. What anti-virus/firewall program are you running? Does whitelisting System Ninja in these programs correct this issue?