1
Defragment per 2 month
Go to Start > All Programs > Accessories > System Tools > Disk Defragment
3
Clean Up per Week
Clean up cookies,temporary files,unused files
Open internet explorer,then Tools > Internet Option > Delete Cookies/Delete Files
To remove unused/double files i.e.same file in two or more places,
Start > All Programs >Accessories > System Tools > Disk CleanUp
2
Store in an Organized Way
Store your file in an organized manner.Like make 3 category of folders .Recently used(D drive),used sometimes back(E drive),used long ago(F drive). Then make 3 folders,1,Office files,2,Games & Hobby Softwares,3,Utility or system improving softwares.This organisation can help you to track your files and when your system crash you can retrieve the files easily
Advices as per information recieved.May work for most of the computers but may not for some.Any damages caused will not make the advisor/author liable.Instruction for Windows XpÔ only.