Is possible to take ownership of a lot of files?

My computer now has the Vista OS, the old OS was the XP. I did not made an
upgrade but Vista was able to keep all my files and move the old os to
windows.old.

Well, the problem is with some files. I have a folder, i.e., with a lot of
files, when I try to open some Vista complains that file could not be
accessed. If I go and take the ownership everything goes ok, of course, but I
have to do it with each file! When selecting all not allows me to change. Is
there any trick to get rid of this?

Thx!