Really sounds like user error.
2 seconds on google:
http://social.technet.microsoft.com/...w7itprogeneral
http://support.microsoft.com/kb/927520/en-us
http://www.wilderssecurity.com/threa...a-loss.191006/
for the mac, to access the stupid dynamic thing you chose you'll have to move the data off onto another drive, reformat the dynamic drive so it is a universal format, then move the data back onto it.
if you just try and solve problems using google first, you'll find it's very simple.