...the link below will help you eliminate un-needed startup programs/services and delete junk files, etc. Please note that this tutorial was originally created for XP, but much of it can also be utilized for Vista as well. (Generally, for Windows Vista, it's not a good idea to delete the .CHK files mentioned in the tutorial.)
Hope this helps.
Please explain to me the step by step process to remove Junk files from my computer.
Lenovo 3000 K Series. Windows Vista Home Premium.