|mmm - I suggest you get a Knoppix or Ubuntu (Linux variants) disk and boot with that. Then copy "all" data to optical media - so as to safeguard your data... After-which consider options re' cleaning out the system and improving ot overall.|
Once you have booted with the Knoppix/Ubuntu disk you can also get on-line. Do so and go to Trend.com - and look for "housecall". Run it and allow it to fully scan your system as is.
Then see how things are via a standard OS boot. If no better etc... post back?
If you do a standard Dell recovery/restore process - than as Wanderer advises - you "will" lose all data etc... Which is why first safeguard it as above (Knoppix/Ubuntu) approach.
Usually (these days...?) you can restore either via a recovery disk (which may have come with the system, or you made it when you received system) or via a recovery (hidden) partition on the drive (usually at the head/start of the HD).
discusses - briefly - both approaches...
Once you do have a working system again... make and keep secure your own recovery set; as in image the drive etc. using Ghost (as you have it already).