You should know a few things before before getting started: 1. Registry "cleaners" and "system optimizers" like SystemSuite are very unreliable, cause more problems then they propose to fix, have little to no benefit, and are somewhat of a scam. Running them on a system is almost guaranteeing a crash or hiccups somewhere along the process. running them is never a good idea. all you need is a good, simple, free anti-virus (like Microsoft Security Essentials), and use the built in Windows Utilities to clean and sped up your computer if needed. 2. This is a Firefox forum, so if you are having a problem with SystemSuite, we might not be able to help you. I'll give you a few things you can do to see if this is just a Windows problem: Run all Windows Updates, install all needed service packs, etc. Update your graphics driver (Firefox uses your graphics card for some rendering, and an out of date graphics card driver can cause problems. [https://support.mozilla.org/en-US/kb/how-do-i-upgrade-my-graphics-drivers https://support.mozilla.org/en-US/kb/how-do-i-upgrade-my-graphics-drivers]. Update all your plugins (Flash, Java, etc.): [http://www.mozilla.org/plugincheck/ http://www.mozilla.org/plugincheck/]. Download and Install MalwareBytes Anti-Malware, run a full Scan. [http://www.malwarebytes.org/ http://www.malwarebytes.org/]. This helps check that there are no viruses on your computer causing issues. You can uninstall this program after you clean off any infections. Plus, I'd strongly recommend removing systemsuite and any other "optimizers" you might have.