The var directory is not created correctly for beta3
and beta4. Beta2 seems to be fine, but I don't know
why. The suspected reason is that the directory
creation code does not handle backslashes as directory
delimiters. Only Windows XP seems to be affected.
Possible workaround: make sure the directory the start
menu entry "User data directory" points to exists and
contains a var subdirectory writable by you.