Download CCleaner from :-

http://www.filehippo.com/download_ccleaner/ (click the download tab)

doubleclick the ccsetup.exe file and install the program...

At the Cclean setup screen &Install opitions Uncheck the Add Ccleaner Yahoo ! Tool bar unless you want it

After installing, go to Start > programs > CCleaner > Options > Advanced > UNCHECK "Only delete files in Windows Temp folder older than 48 hours"

Make sure the "windows" tab is selected

Under "internet explorer" tick...

Temporary internet files
Cookies* > see Note below
History
Recently typed URL's
(leave this unticked if you DON'T want to clear the drop down list in the address window of IE)
Delete index.dat files
Last download location
Autocomplete form history


under "Windows explorer" these are optional, but you can safely tick them all if you wish, they are only "most recently used lists"

Other explorer MRU's
(leave this unticked if you DON'T want to clear lists such as the start\run list)

under "System"

Tick ALL these ...


under "Advanced"

no need to tick any of these (but you can if you want, and realise what they do)


Applications tab...

These will mostly clean out old log files for these applications...

Clean:- (if you use them)

Firefox/Mozilla (optional - leave the cookies - see note)
Opera
Sun Java
ZoneAlarm

...
Personally I clean everything in the applications tab... but you tick what you want...

Note: *If there are any cookies you want to keep (if you remove the cookie for a site you require a password for, you will need to re-enter your passward when you next visit that site) ... click options > cookies > then keep the cookies you want.

click "analyse" if you want to see a list of what is going to be removed, before it is removed.

Or

click "run cleaner" to let it get on with it's work... clicking this will result in the following pop-up

"This process will permanently delete files from your system. Are you sure you wish to proceed?"

click OK.