A few suggestions:
1. Try saving your document into an
older version of Word format (by using 'Save As', instead of 'Save', and choosing an appropriate format). You might have more luck with a .doc file than with a .docx one.
2. If you're currently right-clicking on the file and then selecting 'Send To > Email', try opening a blank email first and then using 'Add Attachment'. (I've no idea why that should make a difference but I've read about circumstances where the 'Send To' method ends up with corrupt files).
3. Try sending your document from a different email account. (Sometime certain email services seem to corrupt files, whereas others don't). If you're not already using it, try GMX:
http://www.gmx.co.uk/
4. Upload your c.v. to a file sharing site and send your employer a link to it. (Again, GMX can help. Simply open an account and use the 'File Storage' option).
5. Use snail mail!