Copied from Wise Registry Cleaner Homepage:
Wise Registry Cleaner free is a powerful free registry cleaner and registry optimizer, it speeds up
your PC by cleaning your Windows Registry.
Most Common PC Problems:
PC runs much slower than when you first bought it.
PC crashes for no apparent reason.
You keep receiving error messages and don t know why.
You need a Reliable Registry Cleaner  By Wise Registry Cleaner you just need a few mouse clicks and
your computer can become as good as a brand new computer.
The Registry is at the heart of every Windows computer. The older your PC is, the more junked-up
its Registry becomes. Badly written programs  and there are plenty of those around  don t bother to
clean the Registry when you uninstall them, and some programs add unnecessary junk to the Registry.
The more junked-up your Registry, the more likely it is to crash or to slow down your PC. 
This freebie does a neat job of cleaning out the Registry junk. It scans the Registry, flagging
orphaned or bad Registry entries, and shows you the name and values for each. It identifies
Registry
entries that may be dangerous to delete, and those that are safe to delete, so you can distinguish
between the two. It also lets you decide which entries to delete, and which to keep. For safety s
sake, it can also back up your Registry before a scan, so that you can restore it, if the program
causes any problems.
Wise Registry Cleaner is one of the safest Registry cleaning tools available in the market today.
Its scanning engine is thorough, safe and fast.
Wise Registry Cleaner will make your Windows computer faster and more stable. It removes the junk
that accumulates in your Windows Registry. You can safely and easily clean your Windows registry.
System requirements:
Windows 98/Me/NT/2000/XP/XP-x64/2003/Vista/Vista-x64/2008 Server.
Pentium 233 MHz or above. 32 MB RAM or above, 5 MB hard drive space or more.