Since Leapfrog so graciously (and pro bono!) made it easy to mix 32 and 64 bit windows in snapshots with their latest release of FDISR, I decided to give Vista 64bit another try. I have long time hesitated coz I´ve heard that it wont be compatible with most of the hardware out there. I thought I have learnt my lesson and not listen to all the negative people out there. I believed them about the Limited User Account "horror" for years, but when I actually tried it a new world opened up Seems like it is the same with the 64bit complaints, for me at least. I had no problems what so ever to find 64bit drivers for all my hardware. All my essential software works just fine even if they are not 64bit enhanced. True is that many of the security software out there needs to be 64bit versions. For example there are not many firewalls or antiviruses vendors have bothered to develop the 64bit versions yet. But I read that the 64bit version of Vista is more secure than the 32bit by design. And that suites me fine since I dont like to bloat my security setup more than nessecary. Anyways. Installation went almost fine. I say almost because if I wouldnt have had two network cards where the other were recognized by Vista 64 I would have to had download he drivers before I started the install. So, sure I was lucky in that sence, but the drivers were available (Atheros Gigabit ethernet network card) After that I could download all the 64bit drivers and software I needed. Rising firewall, which is my prefered FW, doesnt exist in a 64bit version but luckily I still have my Look´n´stop license so there was no firewall issue. The rest of my essential software installed as easy as in 32bit. Games, I have only tried World of Warcraft but it worked just fine (didnt even have to install it, just ran the .exe from wow folder on a another drive) When I decide to migrate to 64bit I know that shadowprotect will work there. I dont use HIPS, but i guess none of them will work anyways. So the HIPS dependant people will have a hard time if they ever want to use 64bit. Vista 64 is a bit faster in program starts. Firefox for example starts within 2 seconds, compared to atleast 5 seconds in 32bit. Same goes for other software, there are a slight improvement in performance ime. The system feels more fast overall. I can say that (i´ve only used it for 2 weeks though) since I got 64 with my 32bit version of Vista I see no reason to go back to 32bit. Conclusions: pro: A bit safer by default than 32bit (and after adding SRP the security enhanced further) a bit faster and it can utilize all my 4GB of RAM. Now I have 1GB RAM drive and if I install VMware I can assign more RAM to the VM´s. Well, thats the pro´s I could think of now. Con: I understand that there will be less [driver dependent] freeware to MS 64bit since it costs money to get drivers approved by Microsoft. That is really, really bad imo, even though I dont use much freeware but I guess it will slow down software development and give even more power to MS. Not many Antiviruses and Firewalls are compatible with 64bit, and that is the main reason for most of the people not to migrate. They dont want to spend time looking for compatible security software.