Anti-Aliasing Option Has Disappeared And Blue Lines Have Appeared

[xXD00MKAISERXx]

Title: Anti-Aliasing Option Has Disappeared And Blue Lines Have Appeared

Version: 3.1.2

OS: WIndows XP

Java Version: 7

Description of Problem:

My option "Anti-Aliasing" has disappeared and strange blue lines have appeared around my blocks. So far I have also figured out that this error is appearing in vanilla minecraft. The way I fixed it on normal Minecraft I installed the Optifine Standard mod. So when I try to install Optifine standard to my tekkit. I get and Error Message that I have posted below. So when I log back in my Tekkit is than turned into vanilla minecraft. I have deleted the Tekkit folder and tried again many times but nothing has worked. Any suggestions on my next move? Note:I have noticed that Optifine is already installed but it does not include the "Anti-Aliasing" option.

Error Messages:

Minecraft Installation Is Corrupted

Minecraft Installation Has Been Cleaned

Login and try again, if it doesn't work click try again.

Error Log:

[xXD00MKAISERXx]

NVM the error is gone now.