My hp/compaq dx2250 exhibits strange behaviors not seen on the other two PC's on my desk (hp/compaq dx2200; dell vostro 3500). OS on all three is Win XP Pro SP3. All have VIPRE Internet Security 2012. Some months ago (when my ISP was AT&T DSL), I tried several Internet speed optimization programs. The results were not good; and for reasons unknown to me, upload speed was very slow. I have changed ISP (now Cox Cable business). I have tried running Internet optimization programs (e.g., DRTCP, TCPOptimizer), but no luck. One additional fact: when I use a website that involves Java script commands to go to another window, it takes a long time for the command to be executed.
What should be my next steps?