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How to change partition letters using DOS?
After uninstalling AVAST, My computer could not restart. Partition letters have been altered during process and need to be set back to correct values. The System reserved volume has now become C. This should have no letter and is normally hidden. The C partition is now marked as D. This is where the Windows installations is stored but it cannot open while the letter is wrong. There is also a data partition, formally D, now marked E. The DOS prompt is only method of working on the computer, Windows cannot open.