remove empty partition on primary disc (C:) ?

My C drive has an empty partition to the right of C.
Can I remove the empty partition to increase the capacity of C to its full potential.
How do I do that without sabotaging my system ?
Do I have to close all programs and open-files to make the changes?
My Pale Moon browser has frozen (and still running) ... I am using Vivaldi browser to lodge this thread.
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Thank you in advance for any help
Windows 7 pro 64bit on a 6 year old ThinkPad laptop
With 23 inch monitor so I can see.

My C drive has an empty partition to the right of C.
Can I remove the empty partition to increase the capacity of C to its full potential.
How do I do that without sabotaging my system ?

windows disk management

rt click the empty partition and select delete

rt click C and select extend

If you are unsure, post a screenshot of disk management window first

Its best to post a screen shot from disk manager showing all details so we can ensure its ok to delete

Should I open the c: drive in Safe Mode to make changes ?

Thank you

That is unallocated space. It is not inside a partition.

Right click C and select extend. No need to go into safemode.

You can extend both c and d or create another partition on d as you have over 200 gig free