CCleaner... cleans out unnecessary files and cleans your registry for you, saving disk space and making your computer run faster.
Try it: http://www.ccleaner.com/

Spybot Search and Destroy... searches for every spyware known and kills them dead. Scans are quite long (about 10-30mins depending on your comp specs) but useful.
Try it: http://www.safer-networking.org/en/spybotsd/index.html

AVG free... free software that updates itself. Azcn mentioned this sometime ago but... unless you are a genius that makes viruses that kills other viruses...
Try it: http://free.avg.com/download?prd=afe

Auslogics Disk Defragmentor... much faster than Windows, very nice animation whilst it is defragging.
Try it: http://www.auslogics.com/en/software/disk-defrag


4 pieces of totally free software that I use and recommend to you if you wish to try them out. Your opinions would be appreciated on each product that you try.

Shadow

first one seemed good, 14 seconds and i regained 600.1MB

so yeah i forgot to clean my PC recently or maybe ever ohwell.

i use spybot already

CCleaner broke windows the last time I tried it.

I use Spybot and AVG.

Vista defragger is fine for me, it runs automatically, too, IIRC.

I use all of that software.

It is also note-worthy that the Auslogics Registry Defrag software is 100% free and I use this as well.
Try it: http://www.auslogics.com/en/software/re ... g/download

I use Spybot S&D out of that list.
I'm happy with 7's defrag, i use scheduled tasks to run it overnight

AV? What's that, oh you probabily mean:


Don't use any xP

I use none of this software on my netbook.

You use your netbook?

It is the new family PC

I use freestudiomanager for all my burnings edditing and dvd creatings. its real basic looks, like old style windows. and its free bet youd never guess, with that name