Cannot open partition

Hello,
Please can somebady help me,
in my computer i have 3 partitions: C: D: E:,
with partiton C and D is OK, but when I try to open partition E,
it si said me to format the disk in drive E: before I can use it

If I press "cancel" (I didn't format the partition because I don't want to lose my data),
the message appear:
"The volume does not contain recognized file system.
Please make sure that all required file system drivers are loaded and that the volume is not corrupted."

Please help to solve my problem