There exists a set of folks who connect to the internet only periodically, to get updates for Windows and other products, then they disconnect again, for some period of time, so you could do something like that.
Connecting to the web isn't really the issue, it's where you go on the web and how well you protect yourself that are determinant factors in the land of potential viruses.
My music computer is hooked up to the web, and I surf all over the web all the time. I have decent antivirus software and keep both it and Windows up to date, and have no issues.
X2a, by the way, contains well over 250 fixes, among whatever functionality that they included, as well.
I believe X2a to have been a good and stable release on my system, for my work flow, and I recommend it.
Bob Bone