Try to use Windows 7 64 bit partition magic free software to extend partition in Windows 7
When C Drive is running out of space, system performance will be influenced, Use Partition Extender to Solve this problem.
Normally we increase partition size in Windows 7 disk management by deleting partition, but Partition Extender will increase partition size without data loss
How to Download Partition Magic Free Software for Windows 7 64 bit on Partition Magic Alternative Partition Extender.
Extend System Partition Windows 7 64 bit in Disk management sometimes have limitations like Extend Volume Grayed out. Partition Extender will fix this.
Move Free Space from Extended Partition to Primary Partition without data loss in Windows 7, Partition Extender will do the job with fast and safe method.