SandDisk Cruzer Blade 8 GB won't open

Hi there! I have just bought a new 32 gb Cruzer pop.  I intend to use it to bring files from work to home.  Yesterday, I installed it at home and had lots of troubles, not being able to use the secure access properly.   Today, I managed to install it at work and everything worked fine.  However, when i plug it at home, back from the office, the secureaccess exe file does not work and the vault icon does not appear.    I am able to use the fdrive only the public vault.   Any hint?   I downloaded a new version of the exe file but did not help either.   Thanks.