*defragment your hard disk...
*remove un-necessary start up entries... i recommend starter... or just use run -> msconfig...
*disable indexing service... right click on your hard disk and properties, uncheck "Allow Indexing Service to index this disk for fast file searching"... then select "Apply changes to subfolders and files". "Ignore All" if any files cannot be dis-index...
*set static page file size
this are few things i can think of...