Would the increased complexity of WinFS make it slower though?
Much like the change from FAT/FAT32 to NTFS, changing the file system unless there is something seriously wrong with it, or unless it was seriously coded very well, would not yield much in terms of speed boost/slow down. But yet again I may be wrong.
even linux is not virus free.....i was thinking that if new filesystem is introduced then at least for some time we will get rid of viruses
Uhhhh, yes it is. Secure logins must be used to block the script kiddies, but aside from that, we have no major security problems whatsoever, and we definitely have no viruses.
All the Linux antivirus apps exist to scan for Windows viruses, and they are frequently used in Linux mail servers.
See http://librenix.com/?inode=21 for someone else's view on the matter.
Oh, and a different filesystem won't stop Windows viruses, if only because some of them never touch the filesystem. Virus writers will adapt, and it won't be a problem for them.
Linux, as others have stated does have viruses. Viruses are user made so, it's possible to code them. As it gets known more and more, users may create more too. However, also Linux creates more security patches in updates. The viruses are very rare, I've never really got one when I tested out Linux.