Hi micoman,
have you tried running sfc/scannow in your command prompt? If you can run task manager you should be able to get it running by clicking on 'new task' and typing 'cmd' then enter.. Once you see the command prompt box type sfc/scannow and hit enter.
Both Kemical and Saltgrass have very good suggestions.
i would disable everything in msconfig except for your anti-virus software, spyware detector, and personal firewall if you have one.
A free personal firewall can be downloaded here:
PC Tools Firewall Plus - Free Firewall Download
How many programs and services are running in Task Manager?
Do you show any problems in Device Manager with any devices?
You might try using the msconfig.exe to set Boot Base video, which can also be done from the F8 boot page possibly under advanced options.
Are you using 2 monitors? What video device do you have?
Do you happen to have another monitor you could try?
You should also have many more processes running in task manager, can't figure that one out.
Could you please fill out your computer computer specs in the UserCP link located at the left hand side at the top of the page.
This could be usefully for us to diagnose.
When I try this it says - "You must be administrator running a console session in order to use the sfc utility" - I'm the only account holder with no password?
Also tried removing graphics drivers and re-starting, but the same
You stated
If you removed the graphic drivers, then it should have picked up and said found be hardware and installed the default Windows graphic driver.
But yet you said you had the latest drivers from Nvidia.
Didn't you get this option?