Testing Windows 7 on a few years old Dell Inspiron, it runs stable and fast, except in Beta, I kept getting an NDIS.sys is corrupt error on boot. Error went away once I installed RC, with two months of everything fine, but it just returned today and none of the usual solutions (Startup Repair and System Restore) seem to be fixing anything. Following running Startup Repair, I see this: Boot manager generic failure 0x000000e Root cause found: ----------------------------- Boot critical file c:\windows\system32\drivers\ndis.sys is corrupt Repair action: File repair Result: Failed. Error code = 0x490 Time taken = 5469 ms Repair action: System Restore Result: Completed successfully. Error code = 0x0 Time taken = 117657 ms Repair action: System files integrity check and repair Result: Failed. Error code = 0x490 Time taken = 677234ms If I attempt a System Restore, on any restore point, it runs through it and gives this message: System Restore did not complete successfully. Your computer's system files and settings were not changed. Details: An unspecified error occurred during System Restore. (0x8000ffff) On boot, I get this: Status: 0xc000000e Info: The boot selection failed because a required device is inaccessible Any idea what could cause this? The network adapters are: Intel 2200LF Wireless Card Broadcom 440x 10/100 Ethernet controller I installed Office 2010 Technical Preview, from Microsoft Connect, on Monday, though it was running fine. Plus, my earliest Restore Point was from Sunday, and it didn't help. Yesterday, I started having an error where the hiberfil was corrupt and the computer would fail trying to restore from hibernation, though each time it did, it booted fine, including this morning and just an hour ago. The hiberfile was 1.5 GB, while I have 2 GB of RAM, but as I tried to fix that error, this killed the whole system. I had just ran defrag, and was rebooting to run disk check, when it stopped being able to boot at all. Any theories would be hugely appreciated. I'd like to fix this, as re-installing on that system, given it's use purely for testing, is something I don't want to do if I'll need to install Windows 7 RTM a week later whenever it hits Technet. For now, anyone with Windows 7 RC, please upload your ndis.sys file somewhere I can download it from, so I can try replacing the file and seeing if that works.