I've been using Netscape for years and the only time I had a problem was after being "hacked" through mirc. Symptome were just as you describe. I cleared out the trojan, reloaded Win 98 and never had another problem since. Netscape 4.7 is the best yet, I really like it. Take a look at the Hacker Warning on this forum and get the software. You'll be surprised at how often strange people try to get into your computer while you're on-line!
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Info noted. Plse report further.