There are few partitions as mentioned below :-
1:- EFI system partition 500MB
This is the Extensible Firmware Interface.
This Partition contains the boot loader, and device Drivers, for any Operating Systems that are installed on other Partitions of the HDD.
2:- OEM Partition 40 MB
An Original Equipment Manufacturer Partition.
I am not too sure what this one is used for by the System.
3:- OEM Partition 500 MB
Same description as #2, but probably it could be Dell™ System Tools.
4:- OEM Partition 12.9GB
I am willing to guess that this Partition contains the Files/Folder required for a System Recovery; however, accessing it will be the problem.
Perhaps you could Right click it in the Disk Management, and see if it will allow you to 'open' it.
If it can be opened, you should see files/folders like "Recovery", and Bootmgr; if so, you'll need to assign a Drive Letter to it, so it can be accessed at start up.
Otherwise, this Partition could be another Dell™ Partition.
5:- Primary Partition 8 GB
This could also be the Partition explained in #4.
6:- Boot, Page File, Crash Dump, Primary Partition 147 GB
Chances are that this Partition is your C: Drive, where all your Program and System Files installed.
7:- F drive :- 160 GB
This is probably a Partition you created for Data Storage.
8:- G Drive :- 154 GB
Same as #7.
To determine exactly what Partitions #2; #3; #4; and #5 are, I suggest that you contact Dell™ Customer Support and ask them what they are for.
If you can boot to the BIOS, have a look and see what (if any) Partitions are visible.
Furthermore try holding the F8 Key, at Start Up, and see if you can enter the Recovery Mode.
If you can; then, you should be able to create a Recovery Disk from within Windows® through the All Programs Menu > Dell™ Folder.
Try the suggestions, and post back with the results.