WinVICE Portable 1.22 (Release 2)
WinVICE Portable executes programs intended for the old Commodore 8-bit computers. The current version emulates the C64, the C128, the VIC20, almost all PET models, the PLUS4 and the CBM-II (aka C610).
Download: http://www.albartus.googlepages.com/WinVICE_Portable_0.22.0.2.paf.exe
WinVICE Portable Page: http://albartus.com/portable/
VICE Website: http://www.viceteam.org/
I'm not totally sure if WinVICE touches the registry or not.