Some programs can lag your computer bad depending on what they are. To see which programs are connected to the internet right now type this:
start -> run -> CMD -> netstat -b
This list shows I'm connected to instant messaging programs. Try closing all your opened programs. If there's any that linger, then it's likely something malicious or super annoying like msngr.exe, windows messenger that seems to not be killable through control-alt-delete, or editing startup.
First thing is to edit startup. Click the startup tab and uncheck any programs you dont want lingering when you turn on your computer. To do this use msconfig and click the startup tab.
start -> run -> CMD -> msconfig
Next click services and organize by manufacturer. Remove any of them you don't recognize, not made by microsoft. If you're unsure search google with the name. Same goes for startup items.

You can start, stop and disable currently running services, and get a breif description of what they do with:

Some programs wont let you remove them.
Checkout my Mp3 and files search that uses google to find music/albums, anime, games and movies with direct downloads. It's very safe and easy to use, just search for a song, then right click save as to download it.
See my new funny pictures blog. I accidently deleted some of the old blogging software which I made, so I just rewrote everything from scratch. This blog won't be updated anymore =/.
I make video tutorials on a variety of topics on youtube. Please help me out by adding me as a friend if you have a youtube account. It really helps.
Clicking the links above will give you a random but extremely high rated video. There are over 15,000 awesome videos indexed so click as many times as you'd like.
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