How to extend Windows filesystem

Hi Expert,
I have defined file system like this pic:

And now, my sapdata_1 and saplog_1 is full and I cannot login anymore..
If login shortdump appear.

"Database ESR segment is full/has no free extents"

Drive D on my server still have 50G.. how can I extend sapdata_1 & saplog_1 on windows sever 2008?

Kindly help me,

Thanks
AP