i have deleted a partition by mistake, which had around 41GB of backup

i am trying to get back partition as it was... the thing is :
originally the HDD is 300 GB, it had earlier one partition.
then i splitted it into 3 Primary partitions...
one of the partitions was 115GB, where again i made it into 2 LOGICAL drives 80GB and 35GB.
I installed Ubuntu on the 35GB one. so i had dual boot (win8 on C and ubuntu on this logical drive)
Then, i booted from Windows --> used Disk Management tool, deleted the 35GB drive (boot drive of Ubuntu),welling then to re-install windows then ubuntu.
But
when i deleted it - the partition went back to 115GB RAW Logical Drive!

i tried a bit with TestDrive, but to be honest, im not very good at that, so im kinda lost now...
Any help please?