Guitarpima
I'll never understand why people won't connect their puters to the internet for short times. I get the idea of not wanting the puter on the net but never? To each their own I guess.
I'd rather not do it and I really wish companies would keep their registration process simple/offline capable (somebody mentioned a Flash Player registration dealie... WTF?) but it's really not that huge a deal. If you are that concerned use FireFox with Adblock + and NoScript and within NoScript look at what the sites are trying to load. Only accept what is absolutely necessary to do what you need to and you'll be fine. Also having Microsoft Security Essentials enabled has never screwed up a download or registration for me even though some places tell you to disable your AV. Some of the registration thingies I've had to use (FXPansion, NI) didn't even open my browser (IIRC).
You can also create a restore point (or if you are really paranoid a system image) before connecting your system and if something goes all wonk you can just go back to that point and it'll likely fix the problem. Set Windows Update if you don't want to MS doing their thing but it's usually good to have things up to date especially if you are installing new programs/hardware.
IDK... I do all my program downloads and updates right on my DAW and occasionally some other stuff. I just stick to trusted sites and keep a working sys image handy. Trying to move crap back and forth between systems is a pain and potential even MORE of a risk if you do sketchy stuff on the download system (viruses hop from the download system where you were looking at porn or clicked the fart button your uncle emailed you onto the USB key or external HDD then your non updated, totally isolated and unprotected DAW gets ravaged by it).
So yeah... connecting to trusted sites with a light (up to date) AV and a good script blocking browser that is set up correctly is very safe. When I first started out I read all the stuff about keeping the system isolated but that is OOOOOLD knowledge and it gets repeated because that's what the pros are used to doing. Not saying check your FB or politcal rant emails from deranged family members every day but for downloads and registration 99.99999999999999999999999+% of the time ain't sh*t goan happen and it saves a HUGE hassle.