I have a Dell Inspiron 1545 but deleted that partition longggg ago. Again suggest you download Macrium reflect, Install and make an image of your Vista system as it is today. Macrium will allow you to make a bootable recovery Cd for emergency recovery. Before trying to use your recovery partition backup your system as you will lose all data since you first started your computer.
1.When the Dell logo appears, press <F8>
several times to access the Vista Advanced
Boot Options Window.
If you wait too long and the
operating system logo appears, continue to
wait until you see the Microsoft® Windows®
desktop; then, shut down your computer
and try again.
2. Select Repair Your Computer.
The System Recovery Options window appears.
3. Select a keyboard layout and click Next.
4. To access the recovery options, log on as a
local user. To access the command prompt,
type administrator in the User name
field, then click OK.