SandDisk Cruzer Blade 8 GB won't open

" I installed it at home"

SecureAccess has no installation.

and had lots of troubles, not being able to use the secure access properly.”

Resolve the troubles and you should be fine.

Since you give no info as to what the troubles are/were or even what OS you’re using you’ll have to figure out the solution.  We don’t have enough to work with.

" I am able to use the fdrive only the public vault."

That sounds like a good approach.