but there is one answer all the regulars here will tell you, "Never use Optimizers and Registry Cleaners". They can and often do make matters worse.
Other than that there is little I can tell you because you have told us nothing about your computer, nor the problems.
All I can say is, if this is Windows, reduce the number of Startup applications as much as possible. Keep the system uptodate with Windows Updates. Run anti-virus scans regularly and anti-malware scans once a week or so.
doea anyone know what i can use to make my pc runs faster and fixes error stoip freezing and crashing and its free to use all the time please let me know