only try..not permanent?
100MB=system reserved. It's the boot partition with bootmgr and bootmenu
48GB=RECOVERY. Used to restore to factory settings in case you have severe problems. I don't understand why it has so much free space!
1GB: Special for recovery as well. Maybe drivers
You want to keep 1GB and 48GB partition? They are useless most of the time! If you hardrive becomes faulty that isn't working as well. And if it is working... you go back to factory settings... AND YOU LOSE EVERY PROGRAM, DATA AND ALL SETTINGS
!! You better backup to external disk. Do you have one?
You can get rid of 100MB partition if you want. I can give you instructions how to move it to BOOT (C)
At least one of those partitions must be deleted. Maximum number of partitions is 4!
Also what's possible: 3 primary partitions and 1 extended. In extended parition can be a lot of logical partitions.
Tell me what you want