I've been using NOD32 v3 on my XP SP3 desktop and HP Vista Home Premium laptop for a while now without problems. I finally got aroudn to upgrading from v3 to v4. V4.0.424 works okay on my XP machine but when I try to do a manual scan on my Vista laptop, it hangs at 69%. At that point, I'm locked up and the only way out is to drop the battery out of the laptop. The installation is "Typical". It also happens on a Custom Scan. Any ideas?