Regshot is a small free windows registry compare tool which can take a quick snapshot of your registry and then compare it with the secondsnapshot.It's very useful when you want to find out what software does to your registry. To do this, just take a snapshot of your registry and savethe report, you can choose a text format or HTML format. Then installthe software, and take a second snapshot, press compare after it'sfinished, then Regshot will show you where the changes have been madeto your registry by the software.
Regshot is a freeware which means you can use it for free and it can even be used to detect the changes made to your hard drives, so it's verypowerful, the latest version is 1.82.
And you can find and use other reg cleaner software as well.
