A discussion we sometimes pop to the top of this forum is the "I'm the only user" and the dangers of having just ONE account or just one Admin account. This not only afflicts XP owners, but Windows NT/2000 too. Read http://reviews.cnet.com/5208-6127-0.html?forumID=9&threadID=17401&start=0 as it reveals how to save your files.
If you need to get that password, it may cost. http://www.lostpassword.com
In closing, always be sure to carry a spare admin account, avoid using IE when you can.
I think someone has hijacked my computer. First, everything began running really slow, including the internet. Second, anit-virus software either would not open, or shut itself down shortly after starting. Third, everytime I try to open a program the computer asks me whether I want the program to "run as" the administrator or my own account. If I try to run it as the administrator, it asks for a password that I do not know. Fourth, if I try to sign onto the internet, it says that only the administrator has the ability to connect to the internet and that the current user does not have access. I am not sure how to rememdy the situation. I have unplugged all of my outgoing and incoming internet cables. Please help.