Heavy graphical errors while playing

[Ohdear]

Launcher Version: Latest

Operating System: Win7 64bit home premium

Java Version: 64bit, latest

Antivirus Program: AVG

Description of Problem:

This video will show you my problem:

http://www.youtube.com/watch?v=RYAWuOrNV7Y&feature=youtu.be

This happens alot and when I have render distance on shortest it doesn't appear that often. But it does.

Error Messages:

None

Error Log:

None

[Torezu]

There are 2 likely causes:

1) You didn't fix your NEI not to display monster spawners. Read the NEI Common Problems thread before continuing.

2) Your version of OptiFine is not performing like it should be. You will want to consider using a different version.

[Ohdear]

1) Where can I find these threads?

2) How do I update it?

[Ohdear]

Sorry for double post, the first one didn't appear...

[Torezu]

1) http://www.technicpack.net/forums/threads/nei-common-problems-and-fixes.2206/

2) Use 7zip to unpack the contents of the OptiFine zip into your modpack.jar (bin folder for the mod pack you're using). I suggest Standard.

[Ohdear]

Okay, I did both of these, I downloaded the optifine 1.2.5 (normal) and disabled the mobspawner thing. Still not working properly.

[Torezu]

Then you probably have graphics driver or overheating issues, or there's something else screwing with your display.

[Ohdear]

Well, it have been working fine before....It started messing after I upgraded win7 32bit to 64bit

[Torezu]

Well, it have been working fine before....It started messing after I upgraded win7 32bit to 64bit

Did you get new graphics card drivers at the same time? That can cause glitches like this.

[Ohdear]

No I did not.