What you have done is enough.
If you still dont see results then best is to take a backup and do a format.

regards,
ASHISH THAKKAR

spyware and registry cleaning works , spywares have the highest effect on computer's speed and they really needed to be eliminated

I love this Dont keep any of your important docs in your system drive when pc start giving problem format and re install this will clear everything.

Every computer with windows on it needs a reinstall from time to time - so I normally does it every other year. I normally back up all settings after my first clean install, and installed every program I need - then make a image backup of the disk - and makes a clean install from this every time I need to.. if the program needs have changed since last backup - i then ad the new programs, and make a new image, and this will be installed when I need a new reinstall - next time :) Quick & simple every time!

ccleaner will be my best option for this.

Well, the best way is not to infect your computer anyway. Then you don't have the problem about cleaning.

I uses system clean software like Norton 360 or some freewares which should clean my download details including cookies,cache,browse history, registry error, hard disk fragment issues etc.. doing all by hands is not possible.

CCleaner is the best software. Try it

Just take a backup of important files and software and format your system. It is the best way to clean.

Ace utilities would be the best option. I would suggest you to go for it. I am sure it will work for you.