I have a Dell Dimension E-310; Windows XP professional....All of the sudden the computer is very slow, I get pop-ups telling me that i have spyware, i get all sort of pop-ups and i keep getting this message about my virtual memory being too low.

I have Norton Antivirus 2006 and it works fine or it seems, i have also downloaded an anti-spyware program (XoftSpy SE) it tells me that everything is fine and RegCure,a program that it is suppose to check my computer find what is wrong and fix it, This last one keeps finding errors. It does not matter how many times i run it...so ....HELP PLEASE !!!!