Windows 7 frequently alters the boot drive letter assignments.
Windows 7 frequently alters the boot drive letter assignments.
You have a 320GB drive setup with a shrunk partition C for Windows 8.1 and a new partition E for Windows 7. After installing Windows 7 and drivers, the system now restructures partitions incorrectly—Windows 7 is using F, Windows 8.1 on E, and C remains reserved. The second HDD stays as D. Attempts to change partition letters in the Windows Repair tool failed to save changes. Consider checking disk management settings or consulting a professional for partition recovery.