Hello. I'm hoping someone can help clarify how I resolve the following problem which concerns incorrect identification of my OS partition. After merging the C: partition - Vista Ultimate (i.e. 64 bit) - with the immediately following F: partition - empty primary drive) my PC failed to boot folloing the re-start instruction in Partition Manager 10. It's a Dell laptop, with a diagnostics partition in the first slot (no drive letter seemingly assigned, though it's probably E: since the lowest available drive letter for the 4th partition was F: ) and a Recovery image in the 2nd partition as drive D: . F: was created earlier using the same Partition Manager 10 tool. I booted via the recovery disk and ran Boot Corrector. Running the "Search Windows Installations to Correct" option shows a first screen entitled "Correct Windws Installations" with a table showing two bootable Windows partitons: the Recovery drive as Partition 1 and the OS drive as partition 2. OK so far, but clicking on the properties button for partition 2 shows the drive letter for the OS as E: instead of the original C: . That appears to be the problem, but the source of this "properties" information is not clear. The help file doesn't clarify this point either. Leaving partition 2 highlighted and clicking through to the next screen shows the drive letter for partition 2 as C: - i.e. correct. Since this is displaying info. from the registry there seems little point in using the Edit Letters button to change it. Nor does there seem much point in returning to the previous screen and selecting the "Correct the partition boot record" option - but I tried it. I received a message saying that theboot record had been corrected, but it hasn't fixed the problem, and the above "properties" button in the first screen still shows the drive as E: . (BTW, the second screen shows the first partition - Partition 0 - as V: ; and shows Partition 2 (the OS partition) as not Active - whatever that means.) So my question is: "Where is the designation of E: coming from, and how do I change it so that the machine will boot?"