Using PC mover

A couple of months ago I purchased a Dell Inspiron 1720 with Vista. I used PC
mover to transfer all data from my Dell Inspiron 5100 running XP to the 1720.
Now I believe I have updates and hotfixes from my 5100 on my 1720. Does
anyone know if I can delete them? Or will deleting them cause me more
problems than I already have.
1. Cannot download or install most updates, some do get through.
2. Cannot create restore point.
3. Cannot uninstall programs.
4. Cannot install upgrades from a CD.
5. Currently disabled windows firewall, and deleted McAfee. No other
firewall as far as I can tell.

Any comments and/or help will be appreciated.

--
opalocka