Hi,

I am using a Dell Lattitude D630 with windows XP

For some reason I have no C Drive today. I also cannot open windows explorer by right clicking the start button. I also have no favourites in Internet Explorer and the internet explorer "history" options are greyed out - I assume both of these are due to these items normally being located on the C drive. I also appear to have no "RUN" option in the start menu.

Can you help please?

Try starting in Safe Mode then choose the option of System Restore.

To start in Safe Mode repeatedly tap the F8 key after starting the computer before Windows tries to start.