I can start my computer in safe mode but not regular

When instart My computer regularly it freezes, however I can start it in safe mode and it works. I have windows 7 64 bit... at his happened after I did the maks hacks to speed up windows 7. I have tried reversing what I did but to no avail. Please help. What info do I need to post to get help?

You could try and use system restore - do you have any saved points?

I tried that also. It was from two days ago. Before I made any changes and after I downloaded updated drivers. Still freezes...

I'm not really sure how to help without some extra info. What changes did you make?

Also, before doing any modification to system files/registry you should always make a full backup, unless of course you really know what you're doing. Backups are your best friend.