PC Tonic

CCleaner ~ Piriform
*****
Available for:
Windows 95, Windows 98, Windows ME, Windows 2000, Windows NT, Windows XP, Windows 2003 Server, Windows Vista

Pros:
1.CCleaner cleans the many types of junk files (like temporary files, URL history, Recycle Bin files, recent documents etc.) from your computer. Support for a large number third party software, like Mozilla Firefox, Opera, WinZip, Netscape, Nero, eMule, Kazaa, Adobe Acrobat Reader, WinRAR, WinAce, Safari etc, is available.
2.CCleaner is also effective in removing all types of obsolete registry keys from your computer.
3.It is small and extremely fast.
4.A good set of configuration tools are available.
5.The full version of CCleaner is free.
6.The version is frequently upgraded and errors are constantly fixed.

Cons:
1.CCleaner has comparatively less features than some other system optimisation tools.
2.Real time monitoring of the system cannot be done.

Get CCleaner:
CCleaner home page
Download.com
FileHippo
Piriform home page

Glary Utilities ~ GlarySoft
*****
Available for:
Windows 98, Windows ME, Windows 2000, Windows NT, Windows XP (64bit version unsupported), Windows Vista (64bit version unsupported)

Pros:
1.Glary Utilities offers a wide range of system optimisation tools for removing junk files of every possible type from your computer. It’s an all-in-one optimisation package for Windows. The Disk Cleaner feature is more powerful than Windows’ inbuilt Disk Cleaner utility. The registry cleaner removes a wide variety of obsolete registry entries. There are about a dozen more features in Glary Utilities, like uninstall manager, shortcut fixer, memory optimizer, tracks eraser, disk analysis, file encrypter and decrypter, IE assistant, duplicate files finder, process manager, direct access to Windows Standard Tools, duplicate files finder etc.
2.Updates are received at regular intervals.

Cons:
1.Some features like spyware blocking are missing.
2.Glary Utilities is comparatively slow.
3.There is no “single-click repair” option.
4.Real time monitoring of your computer is unavailable.

Get Glary Utilities:
Glary Utilities home page
GlarySoft home page

Advanced Windows Care Personal ~ IObit
*****
Available for:
Windows 2000, Windows XP, Windows Vista

Pros:
1.Advanced Windows Care Personal offers a wide variety of optimisation tools for complete cleaning of your computer.
2.The all-in-one scan feature looks for every possible defect in your computer and removes them effectively.
3.An option to permanently block a large number of spyware and adware is available. Spyware and adware already present on your computer can be detected and removed too.
4.Updates are received frequently.

Cons:
1.Advanced Windows Care Personal is ad-supported.
2.Real time monitoring feature is unavailable.

Get Advanced Windows Care Personal:
Advanced Windows Care Personal home page
Download.com
IObit home page