hazy when opening applications

if by 'hazy' you mean verticle blue lines going down the screen, and increasing when you move stuff around (after having the application), then yes, I have that problem on my work PC, win98 with 80 megs of ram, pentium 100-,
the problem on my computer is RAM, being that i have a very slow computer, my computer depends heavily on the ram, for processing, and if i have anything more than one program open i get blue verticle lines, making it hard to read the screen,... my suggestion is running msconfig (from start - run -) and clicking startup, and removing all programs except for your virus program and your scanreg, then you will have some more resources free, and will probably noticed increased performance (up to a point...)
Hope this helps,
Ben

Is this an upgrade on an older PC? If so, then I would consider finding updated drivers for Win98 and your video adapter. The first answer can work, but it might not cure what's causing the problem. What type of PC and video adapter are you using? What other programs are running in the background? If the drivers are current, try reseating the video card or reinstalling it in another slot. Good luck!

If there is a hardware problem with the video (most likely a defective RAMDAC chip)you should try replacing it. If the problem is caused by the drivers of the video card, then try reducing the hardware acceleration (right click on "My computer" then go to properties tab, then performance tab)to it's lowest level and see if that does anything useful. If it does, then try other drivers (not only the most recent which can often cause problems).
If none of this works, then your problem may be caused by a virus like program which is called a "joke". This kind of program does nasty things to your computer without damaging it or your data. If this is the case, try an antivirus program and/or run msconfig to see if there is a program you never heard of loading at start-up.