Access denied to encrypted files after changing password

I had certain files encrypted under a standard user account on Win 7

I changed my password, and then lost power without logging off. After logging in again I was no longer able to access those files. Changing the password back to the original did not help.

I have imported my backup certificate to the personal store with the correct password, although this did not grant me access.

I have tried importing my cert as an admin user and taking ownership, still no dice.

Is this because I did not backup my certificate/key after changing my password? Have I now lost access?

What can I do?

Try a system restore to a point before you lost power.
1.type in system restore in star menu
2.choose a point before you lost power.
3.Scan for affected programs, and make sure you want to continue.
4.Press finish and system restore should begin

I don't use System Restore.