Hi Steve,
I have closed the other thread and we will continue in this one please.
The purpose of merging to two partitions is so that you do not need to do anything as drastic as reverting to factory settings.
If you do this you will lose all of the data on C:\ drive.
You will lose any software that you have installed.
You will lose all of the security updates.
This really should be a last resort.
We can merge the two partitions so that you have one large partition if you wish.
This will give you plenty of space.
We are working on Win7 as it says in your details ??
Which way do you wish to go ?