Vista Tutorial - crashes

i seem to have an annoying problem with a couple of my newly upgraded vista
computers.
1. for some odd reason i cant access my documents, my pictures, my videos
folders . keeps on crashing, explorer, not internet explorer. i cant manage
to go through any of my files or surf through my computer. its annoying and i
cant find the solution to this problem anywhere. Its always saying that it is
restarting and then says its looking for a solutiong. i cant even manage to
load up Microsoft Update. Internet Explorer works fine and the internet in
general is great, but i cant manage to run anything internally.

2. on my other computer i cant manage to log into a network. again, i
managed to download the updates from linksys but nothing seems to work. It
says that it is logged into the network but whenever i want to run something
like IE or Firefox, it says there is no connection even when it cleary
states that there is a connection.


If there is anyone out there that knows the solution to any of these to
problems please let me know.
thanks