If Ollydbg doesn't work 100%, cheak your memmory in your pc, I had 2 x 2gb from producer A and 2 x 1 gb from producer B, ollydbg could't scan for text strings and more. I removed the 2 x 1gb and now olly works 100% on Windows 7 64 bit.

Edit:
Use only the same kind of memmory!