Help! I am having problems activating Microsoft Office 2007

I have a 180 day trial version of Microsoft Office 2007 Professional. I
received from my computer class at school which came with the text books. I
downloaded it with the disc. Have it all set up. I went to pull up the
syllabus from my professor. The activation wizard on microsoft word comes up
stating that the date is not right and to set the date and time. Everything
is right but I keep getting this message. I cannot up load the file because
of this. I keep trying nothing seems to work. It also will tell me that I
need to repair the MSXLM 5.0 to run setup and repair I don't know what it is
talking about and how to do this. Please help me. I am so far behind on my
online class because of this problem. It is very frustrating. Is there anyone
out there that can help me PLEASE!!!!