Does your computer take a long time to start. Then there a solution for your problem. Your comp slows down mainly because of bad registry file which can be removed by using one of these two softwares.
1: JetClean
1: JetClean
JetClean is a free registry cleaner from BlueSprig. It works on both 64 bit and 32 bit windows operating systems. JetClean can scan the whole computer in just second and while installing there are no unnecessary installations required. The only drawback which could find is that there is no portable version of this software.
JetClean can be downloaded here
2: CCleaner
CCleaner is one of the most user friendly free registry cleaner found on the internet. It prompts you to backup registries before you delete it. This software works on all versions of windows operating systems including the new windows 8 and also 64 bit is supported.
CCleaner can be downloaded here.
Registry Cleaning Softwares