Try to lower your refreshrate ASAP!
This could be a problem for your monitor!
With older monitors, there is a horizontal narrowing of the picture noticable when you exeed the standard design limits of your monitor.
They also tend to darken and vertically stretch the picture a little.
This can also couse damage to your monitor!
If you can startup in a kind of Safe Mode as like in Win98, do that and reset your Refreshrate to less than 100Hz.
It cannot hurt to lower the resolution also.
If done, restart and see if you can reset these value to a usable type for this monitor.