|Please follow the steps|
1. Isolate the machine from your production network.
2. Please scan your computer with Spyware Scan. It will detect and remove virus, spyware and adware from your PC. Click here to Download Spyware Scan
3. As your system is now virus free, you need to clean your registry with bad entries created by System Tool infection. For that you can download and install Windows Repair Registry Tool. It will repair all the bas entries in your registry.
For more information to remove System Tool, visit this page: http://www.removesystemtool.net/