With what did you encrypt the files with? Could you be more precise? was it windows encrypted file system? or something like truecrypt? are you logged on as the user who encrypted the files with the windows encrypted file system? Need more info to help you!!
How many user accounts are on the system?
My Computer
At a glance
windows 7 home premium x64AMD Athlon 64 x2 5200+7.00GBNVIDIA GeForce 9600GT