See if it will let you boot into the last good configuration. A system restore, given your circumstance, may be another workable option.
I tried that already. Would it have something to do with the system not recognizing my service tag? I'm working with a Dell laptop and the last time I purchased and downloaded some anti-virum software it would not allow me to register it because it did not recognize my service tag. After many call to Dell service, I became frustrated because they wanted me to purchase help. I will never buy another dell product. It's only 2 yrs. old.
Boot the PC to Safe Mode, go to Start >> Programs >> Accessories >> System Tools >> System Restore and select Restore my computer to an earlier time.
Then just select a restore point from before you were removing programs.
If that doesn't work, shut down, insert your XP CD and boot from it then run a Repair installation of Windows.