did you try bumping the cpu volts a little?
This sounds to me like the OC wasn't ABSOLUTELY stable so w7 is having a bit of an issue with it.
another issue might be your ram
please fill out your system specs in the user cp to aid us in helping you.
I don't know much about intel overclocking but I do know that northbridge voltage needed to be bumped on systems without an integraded memory controller so that may help too.
I would wait for the opinion of someone more experienced to confirm/deny what I know.
This sounds to me like the OC wasn't ABSOLUTELY stable so w7 is having a bit of an issue with it.
another issue might be your ram
please fill out your system specs in the user cp to aid us in helping you.
I don't know much about intel overclocking but I do know that northbridge voltage needed to be bumped on systems without an integraded memory controller so that may help too.
I would wait for the opinion of someone more experienced to confirm/deny what I know.