I personally use only ccleaner but there are many system opt software what do u use & why ??!
We use nothing, ccleaner mostly and once every blue moon optimizing the c drive for faster loading of services: How to speed up boot process under Windows Vista or Windows 7 - MSFN Forum
Windows defragment tool is great, but it lacks absolutely any control, hence we use third party tools.
Auto defrag time, background defrag, defrag levels, i.e light or complete, defrag+optimize to increase speeds etc.
A. CCleaner to delete temps files, fix startup entries, uninstaller as well as to fix registry issues.
In C drive the files are laid out by the OS using a special method so it loads faster, say the files to load at start up are A, B, C, now in C they will be laid according to this order, but defragging them compacts them to say BxxxxxxAxxxxC, xxx representing the other files, so it becomes slow, the inbuilt windows defragger does not defrag C very much just for this reason(it will defrag documents etc but it will leave out core windows files), but external defraggers tend to compact the files to much, best way to optimize C is to use the method I posted above.
Seems interesting. My boot up time is ~70 secs, will there be any difference if I apply that method?
Try and see, worked for me.
I'm not sure, so use the win 7 version: Download Microsoft Windows SDK 7.1 from Official Microsoft Download Center