right click my computer and go to properties. It will tell you under 'system'
If your Start Menu has 2 columns, right click My Computer. Otherwise right click My Computer on the Desktop

Click Properties from the menu

The Service Pack installed will be listed under System (no entry here indicates no Service Pack)

Edit: Too Slow....
PRS SAS or Gibson LP Standard+
Teese WOF->Analogman Sunlion->Dr. Scientist Elements->Foxrox Aquavibe->Strymon Timeline->Eventide Space
Mesa RoadKing II and 2 Vox AC15s run in stereo