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Corrupt partition, can't boot, Startup Repair loop, tried chkdsk
Recently, my computer had a few files that were "corrupted and unreadable" and upon restarting or powering on the PC, it would run chkdsk before booting to Windows. It failed a few times, but once I luckily managed to get it to boot after running Startup Repair for the first time. This was when I only had 2 options (startup repair or run normally, which would fail and keep looping). My PC loaded really slow and I experienced even more corruption like files not reading, games not running, etc. So I restarted and tried Startup repair again. This time it took extremely long (left it over night for about 10 hours, woke up still hanging) so I just manually turned off the PC. Now it keeps doing the same useless looping without really fixing my HDD.
Today I tried booting from the install DVD, using Recovery Environment to run cmd prompt, then "chkdsk /f /r" (based on some online tutorials I found) , but it would take at least 2 hours each time, and mostly says "file record segment is unreadable" around 180000 all the way up to around 300000+. It didn't say whether anything was fixed, it just deleted a lot of random files near the end.
I have a 600 gb WD velociraptor split into 2 partitions. Through the recovery environment, I noticed that:
C: was system reserved at 100 mb,
D: was the first partition (which was blank and said 0 MB for some unknown reason), and
E: was my second partition with some data and an old image, which surprisingly I can browse through.
I tried using cmd to load up the D: drive that Win 7 was installed in, but it says "file is corrupted or unreadable".
Right now, the RE says "unknown location" or something when trying to detect the primary location of the OS, even though through DVD RE cmd it is currently at "D:". When I type "cd D:" it says "file is corrupted or unreadable", and when I click on load drivers, it is blank and has "0 mb".
I even downloaded a Windows 7 update too within the past few days. I heard that this problem would've been prevented in an earlier patch, but apparently not.
I suspect the registries are corrupted which is causing the endless loop at boot, and bad sectors and such but I don't know how to fix this.
Please help, I have lots of important software I have on that drive/partition and would prefer it if I didn't have to re-image it, let alone reformat and do a clean Windows install. Thanks.