Color differences-please help

I really am stumped here and am pulling out my hair - please someone help me with the following... I hope I can describe it well enough.
In viewing/creating anything in photoshop 7.0 (and I tried 7.x) the color is different than in any other program... if for instance I take a solid red 255,0,0 and fill a new file - it appears more orange than red. I can take the color picker and it shows the correct RGB say of 255,0,0 but again, it shows orangish on the screen. ALL other graphics programs, including Imageready DO show the correct color... but NOT Photoshop! - I have tried changing the color preferences up the wah-zoo - nothing. I have tried reinstalling photo 7.0 no avail, I think (or thought) perhaps it was after I downloaded CS to try - to see if I would upgrade ???? this could be far off the mark, but at this point my graphics development work is hurting because I if I develop/create anything in photoshop I have to have another graphics program also open just to see what the true color looks like.... PLEASE help. I really don't know what else to do besides finding and deleting ANYTHING related to photoshop/upgrades etc and reinstalling again.
Thanks

Try Callibrating your monitor. it sounds stupid but it might help.