Registry problems are the most common reason for Windows PC to slow down and performance issues.
Reg Repair is a free registry cleaner utility which claims to delve deep into your Windows registry and find and fix potential causes of performance problems. The first problem you may encounter when installing this software however is that your antivirus checker may detect it as spyware. The reason is that it requires access to your registry which all good spyware and anti virus scanners protect. It's also because the program tries to establish a secure (https) connection with Digital Support online service which it needs to perform checkups and be updated with the latest registry threats. You may see "dsweb" displayed at some point in the alert which refers to the utility that checks for updates. The one unusual aspect of this program is that, after the simple scan and presentation of results, you can be linked directly to one of the developers online support technicians to work out what the problem is and whether it is a threat. Of course, you have to pay for this service although you can perform a basic clean for free at your own risk.
A quick and simple registry cleaner that features support from real engineers in case you are unsure or worried about deleting a particular registry entry.