Windows XP - Doesn't Respond After Rebooting.

A friend of mine is having problems with her Windows XP, she has a Dell machine. Here is what she sent me, any clue what it can be?

When I reboot my computer and log back into Windows I can not launch the interenet and sometimes not event Microsoft Word etc. It sometimes take almost a day to get it back up. You have to keep cutting it off at the power switch because it will just sit there then out of no where it will launch the internet. This is Aol or Firefox or Chrome

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