Problems Saving!!

I have Windows XP Home Edition and am using Windows Movie Maker version 5.1
with SP3. I have had no problems saving photo files with music files into a
..wmv video, however, when I try to save photo files, music files and .wmv
video files, I get an error to check if the files have been moved or if there
is enough space in the directory where I'm saving the file. The .wmv movie
files I'm trying to save are only 30mb each and I'm trying to save three for
a total of 90mb. The muisc file is only 1mb and the images total under 1mb.
So, there is plenty of space on my computer for it to save the file, and, all
the files are exactly where they were at the time of trying to save as they
were when I imported them. I have tried increasing virtual memory and trying
to save in .avi format and nothing works. I cannot understand why I cannot
save .wmv files into a new video file. I have searched until I am blue in the
face for a fix to this and have found none. Can anybody help me here before I
go grey and rip out all of my hair?