Can i use windex on mu computer screen?

I think it's fine for CRT monitors (traditional monitors), since they have a glass surface, but I would hesitate to use it on an LCD (flatscreen). For an LCD, just use a damp cloth (water only). If you have a very stubborn stain or mark, then dilute a little bit of the Windex, and rub it on with a soft, lint-free cloth. Then, wipe the whole thing down with a damp cloth.

Can you use windex on your computer screen? Yes sure, but if you do, (1) spray that substance onto a clean cotton towel or perhaps a special wipe. T-shirts are often 100% cotton so look around, grab the nearest T-shirt you dare to take, see on its label that it is 100% cotton, and proceed. (2) clean up thouroughly; do not leave residue on the screen, nor on any part of the case/housing/external finish. Use another part of that same cloth that is still clean, or use another cloth and perhaps also a water-dampened cloth and remove the residue so you will not have a gradual buildup of soap or chemical. I suggest just using a dampened cotton towel or t-shirt, followed with a second clean dampened or dry cloth, followed with a third clean dry cloth to completely clean and dry the surface. Do all this cleaning with the monitor powered off, please. Be very gentle, using only the lightest pressure if you are cleaning LCD flat-panel displays. Get all of the residue removed. And for the occasion that someone has gotten white-out on the screen or pen or marker, then the screen wipes that are alcohol based will be helpful for breaking that material up. Most times, avoid the alcohol wipes as that just floats and smears the usual oils from oily fingers, fried chicken oil-fingerprints and hand lotions.

No no, use micro clothes bought in drugstores or go inside a electronic department store. They sell special rags for this a special spray.

I always use windex & my screen is fine.

Use rubbing alcohol. It has a very low water content and evaporates quickly.