"out of range" monitor message after Win 7 upgrade

Hi all, hope someone out there can be my saviour and come up with a fix for this.

My hard drive on my PC failed so had to buy a new one & at the same time upgraded to Windows 7 Ultimate 32 bit, and here comes the problem....my monitor I'm using is also my TV (Bush 27" LCD) and once windows boots up I receive an "out of range" error message on a blank screen. I'm using the same screen as I was when I was running XP but on Win 7 it just doesn't seem to want to play ball. I've received this message before on XP but just needed to change the refresh rate down from 75hz to 60hz which I've done this time round but it hasn't solved the problem, anyone have any advise for me?

I'm using a VGA cable to connect my monitor to my PC (my monitor doesn't have a DVI port, but my PC does). I'm currently using monitor from another PC in the house to use my PC so I know that the video card's working, there must just be some kind of conflict somewhere.

I've updated the driver from the nVidia website so have the most up to date drivers and the settings (as far as i can find) are the same as they were in XP when it was working

the monitor/TV I'm using is a Bush LCD27TV005/A.

The current settings are; Refresh rate 60Hz, the resolution is set to 1024 x 768 & I'm using True Color (32bit)

Thanks, but do you know which specs need changing because I'm not sure otherwise I would've changed them already

Use the 'Auto Adjust' button on the monitor