My OS is win 7 prof 64 bit, in my research to find out why my Outlook 2007 is hanging up, and I came across this utility which promises to fix it. Hope the experienced Gurus who had used this program share their results, whether it will fix the issues or fix it and create more issues or fix the issues completely. I have McAfee, and it did not report anything. I also had run the Malware software and there were some Trojans that were removed. As I have so many evaluation programs that I had used once or twice and then was sitting in the pc, I decided to remove them using the Revo uninstaller, one by one of those known programs that I have not used at all. My strategy was to remove only a few of them at a time, then after a day or two, remove more and clear the clutter. Hope this did not cause the problem.