Tips for Windows Server 2008 - http://blog.monitis.com/index.php/2011/05/01/20-tips-how-to-get-the-most-out-of-windows-server-2008-part3/

Some say putting this parameter at boot.ini can enable 3.5 GB memory on 32bit Windows XP [/NoExecute=AlwaysOff /nolowmem /PAE "/3GB /userva=3030"]
 
Stop system service is not use, http://www.blackviper.com/WinXP/servicecfg.htm and http://www.theeldergeek.com/services_guide.htm and 

Enabling DMA - http://windows7themes.net/how-to-enable-dma-in-windows-7.html

Here is NTFS tuning tips: http://www.windowsdevcenter.com/lpt/a/5606 

Some more links should check
http://tweaks.com/
http://www.windowsnetworking.com/kbase/WindowsTips/WindowsNT/AdminTips/Miscellaneous/WindowsNTMemorymanagementparameters.html
http://www.pcstats.com/articleview.cfm?articleid=1590&page=11
http://www.pcstats.com/articleview.cfm?articleid=1590&page=9
http://www.pcstats.com/articleview.cfm?articleID=1590

