Here, run
CCleaner
1. Do the "Cleaner" part of it first
2. Go to Tools and Uninstall all programs that you do not use. Be careful because there may be programs in there that are not named very clearly that are actually components of things that you use all the time, so only remove things that you can identify as unused.
3. In the Startup section of Tools, disable everything on the list, except for the things that you specifically want to run at startup
4. Go to the Registry section and have it scan and fix all of the registry problems.
This should help.