here's what you do if you're on windows:
Revo Uninstaller Pro - Uninstall software, remove programs, solve uninstall problems
CCleaner - Optimization and Cleaning - Free Download
Defraggler - File and Disk Defragmentation - Free Download
Speccy - System Information - Free Download
BillP Studios - WinPatrol 18
Microsoft Security Essentials
Malwarebytes
PeerBlock ? Peerblock Site
SUPERAntiSpyware.com | Remove Malware | Remove Spyware - AntiMalware, AntiSpyware, AntiAdware!
Disk Space Fan - Download disk space management software
get avast if you don't have MSE
Most of these can be had here via a one-click background install: Ninite Easy PC Setup - Silent Unattended Install Multiple Programs At Once
Scan once a week while you sleep. CClean 3-4 times a week, as well as using the registry cleaner part. Between Revo uninstaller and ccleaner your registry will be fine.
I used this on another pc and it is a great tool forgot the name.. thx ! +repsGlary Utilities
Acronis True Image