This error message normally means there is some license conflict.
You could try the instructions as per SolidWorks KB S-018301:
This error can occur if there is a conflict with previous license data on the computer. To correct it, clean up earlier license data in the following location:
Additionally, run the following command from a DOS/Command Prompt
C:\>”C:\<SolidWorks Install Folder>setup\i386\swactwiz.exe/”dellic /primprod:solidworks
Once these actions are completed, launch SolidWorks and (re)activate.
If this doesn't help then perhaps the IT department should contact your schools reseller for further assistance on your behalf.