Good! You now officially have a known problem.
You probably do NOT want to use a browser to open jpg files, although Netscape 7 wants to do so (and did do so in your case). I believe that, in Windows 98, the default program for opening jpg files might normally be "MSPAINT.EXE". You now have a few choices.
1. Change the file "associated" with jpg files by using Windows. To learn how to do this, click on Help in the Start Menu. Open up the Index Tab and type in the word, associating. Choose the topic "associating file types with programs." Then pick "to change which program starts when you open a file." Follow the procedure found there. You could try to change jpg files to open with MSPAINT.EXE, which is found at: "C:\Program Files\Accessories\MSPAINT.EXE". This choice may be too difficult for a beginner. (There may be easier ways to associate files.)
2. Download a third party viewer that would probably force association of jpg files (and others) to itself. See this
topic to see a discussion on how to do this, although you need to keep in mind that there the problem was Netscape 6.
3. This is really NOT a solution. Install the new, improved Netscape 7.02. You would probably want to erase any old profile files found at a location discussed
here. You would then
uncheck options so that Netscape 7 would not handle jpg or other files which you want handled by a different program. You would still have to set up another program to handle jpg files if Netscape did not return control to the default program (whatever that is in Windows 98 ).
4. Wait for someone with an easier or clearer method to help you.
[PS: Click on the blue words to link to the locations that I am pointing you to.]
[I warned you that it would be a messy discussion.]
[Edit: MS Knowledge base note:
How to Create a File Association in Windows 98 and Windows Me]
UserAgent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4b) Gecko/20030427