My poker tracker is making everything really slow.

[sakki]

Windows starts a bunch of unnecessary services on startup by default. They are running all the time and waste your resources.

Many of them can safely disabled. There used to be a website at blackviper.com with good instructions on what you can safely disable. Unfortunately that site isn't up anymore. However, you can access it at web.archive.org:

Blackviper archive

Remember to back up any important data before modifying your computer.