I recently had to replace some bad memory which caused my home built system to fail to boot into Windows. I have a dual-boot (XP on one HD, and Win7 on a separate HD). The system has been running smoothly for more than a year until the failed RAM module. I can boot into XP, but not into Win7, not even Safe Mode. On startup, it fails to boot into Windows 7. I get "Windows Error Recovery" with 2 options: Launch Startup Repair (recommended) and Start Windows Normally When I choose Launch Setup Repair, it says it cannot repair this computer automatically. The Problem Details are: Problem Even Name: StartupRepairOffline Problem Signature 01: 6.1.7600.16385 Problem Signature 02: 6.1.7600.16385 Problem Signature 03: Unknown Problem Signature 04: 21200566 Problem Signatuer 05: AutoFailover Problem Signature 06: 19 Problem Signature 07: BadPatch OS Version: 6.1.7600.2.0.0.256.1 Locale ID 1033 I hit Finish, then it shuts down. Then I boot into the system DVD, and selected Repair your computer, which gives me the System Recovery Options: I selected Startup Repair, and every test was completed successfully with a 0 x 0, except one, and it said: Root cause found: A patch is preventing the system from starting Repair action: System files integrity check and repair Result: Failed. Error code = 0 x 490 The odd thing is, when I repeat this test, this same error code appears, but later on it also says: Root cause found: Startup repair has tried several times but still cannot determine the cause of the problem I tried "bootrec /fixmbr" and "bootrec /fixboot" and got "The operation completed successfully messages" for both, but they didn't work. I also tried "bootsect /nt60 SYS /mbr" and got the message: "Successfully updated NTFS filesystem bootcode. Successfully updated disk bootcode." I also ran"bootrec /scanos" and "bootrec /rebuildbcd" from the command prompt and got the message: "Total identified Windows installations: 0" Could this be my problem? That even though Windows 7 is listed above as "(recovered)" in the Windows RE, that maybe Windows 7 is just corrupted beyond repair? I'm hoping that's not the case. In addition, this issue has wiped all my restore points as well as system images. Any held would be greatly appreciated!