Help!

I want to do a factory restore of Vista on my XPS M1530. However, on Advanced Boot Options, I cannot find "Repair your computer", which the manuals refers to. I have have a thorough search around, and another suggestion was to press Ctrl + F11 on boot up, which you enable you to get to the restore this way. However, that does not work.

Does anyone have a solution to getting "Repair your computer" to reappear on Advanced Boot Options?! Thanks!

Edit: I do not have any Dell recovery disk (was not supplied with one), and the recovery partition is still present on the laptop and has not been removed. Any suggestions would be appreciated