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Believe it or not, (at least in 2k, I'm not sure about other 9x, me, or XP) if you put a shortcut to Notepad on your desktop or in the quick launch bar, you will not be able to view source code.
1) Open your control panel and use Add/Remove and get rid of all software that you no longer use. I have seen poorly written software wreak havoc on windows systems. Also get rid of any useless programs like screensaver software or browser add-ons. Any goofy software that changes context menus or runs in the background.
Have Norton running all the time.
2) Get rid of Norton which bloats your system and offers little to no protection against anything.
3) Download AdAware are any similiar program that finds spyware on your computer.
4) You didn't say what version of windows you are using but anyway, open up your run menu and type msconfig
I don't remember if it's in the same spot for all versions of windows but look for something that says "Load Startup Items" with a checkbox of some sort next to it. Uncheck this box and reboot your computer.
When your computer reboots open up msconfig again and go to the Startup tab. See if any programs have re-checked themselves. If any programs have. Do a search on google and see what they are.
None of the above may help but none can hurt either. Oh, and if you really want to protect your system from virus's and what not don't waste your time with all those software firewalls. a) Get a hardware firewall and use it, there pretty cheap these days and offer protection without updates or patches every other day. b) Don't install gimmick software or content from questionable sites c) Dont open email attachments.
Good luck.