Why my minecraft is so extreme lag when I installed Shaders mod?

My Minecraft 1.7.5 has extreme lag! When I installed shaders mod. It's not lagging when I'm not loading worlds. When I select Shaderspack my minecraft is lagging then freeze. I'm on Windows Vista Home Premium. My Java Version is Java 7 Update 55. My minecraft is very smooth when I uninstalled Shaders mod and Shadersmodcore

Why won't my minecraft open?

I recently downloaded Minecraft back onto my computer. I had used to play it without an account over a year ago but decided to buy it this time. I downloaded the.exe onto my computer and clicked it and all that happens is the waiting icon spins for about a second then stops and nothing opens. I used to play this game a lot and it worked every time. I also used to add mods to it and what not so I don't know if that has anything to do with it. I deleted the bin folder in appdata and clicked the.exe icon again and nothing happened. The program doesn't even run so i can download it or update it. It's not in my control panel to uninstall. Please help! I don't know what else to turn to. I'm running on a laptop using windows vista if that helps.

How to reduce minecraft lag?

I have a computer that is not so great, and the lag I get on Minecraft is very annoying.
The lag is not so bad on vanilla, i average about 9 fps, but as soon as I add in a mod, my fps decreases to 2.
I have downloaded Forge 1.7.2, and I have downloaded the mod optifine, but when I have optifine running my minecraft doesn't even open. It opens with other mods just not optifine, so I was wondering if there was a way to decrease lag without having optifine running. I have decreased all the settings but the lag I get on mods is unbearable.
Any suggestions?
:)

Can someone download these minecraft mods for me?

Can someone download these mods for minecraft and send me the.minecraft through mediafire? I tried literally everything I watched so many videos and tutorials but I can't get them to work. The mods I want are Touhou items mod ver 1.6.4 and the Madoka Magica mod (also known as the QB mod or the MadoMagi mod) ver 1.6.4. If you could help me out with this I'd Really Really Really appreciate it.

Sims 3 resets config. And closes?

I've been playing The Sims 3 + all expansions at medium video config. For 5 months very well. About 2 weeks ago TS3 restarted all config. (audio, video, gameplay etc) to default everytime I start it, then lags more than the game used to, and crashes, sometimes blue screen appearing. What should I do?
(also Minecraft with mods started lagging a lot.)

My minecraft mods won't work?

Ok so i downloaded forge and everything i know how to get to the minecraft folder and the mods folder so i get a conpatible mod put it in and my game crashes at the launch. I don't know if this is anything to be concerned about but my mod folders don't look like books they look like folder… So if you need it ill post the crash report too oh i have a windows 7 pc