It sounds like you're on an A500. The advice you've been given will work on an A1200 but I'm not so sure if the features of Degrader will work on an A500 so well.
AmigaToPAL will patch your system so it will open PAL screens on your 1702 monitor. I doubt it will work on your PC's TV card if it's set to display NTSC video only. Note also that you need an ECS or AGA chipset Amiga to display PAL mode on an NTSC Amiga. (Many A500s shipped with the Fat Agnus chip but not the Super Denise chip.) The only way to find out is to try the respective patch. (The patch linked above comes with two patches, one for patching an NTSC Amiga to PAL and the other to go the reverse direction.)