Ubable to transfer a folder from Win XP to new Win 7 pc - please help

I have Win XP SP3 and am in the process of migrating folders and files
to my new WIn7 Pro desktop. Most all the transfers have gone without
any problems; however when I try to transfer my family history folder
with multtiple subfolders, files and copies of emails and photos I am
unable to either move or copy this folder to a CD or thumb drive. I
get a popup error message that tells me I cannot copy or move it.

I have tried easy transfer, dragging and dropping and copy and paste
and none have worked?

I would really like to be able to save this folder with my years of
family history searches, but seem to have hit a brick wall.

Can anyone suggest a way to move or copy this folder.

Frank