Ive got a strange problem developed which I thought might be Virus, but have scanned PC off and online which indicated 0 viruses. However when I open a .txt doc in notepad it looks OK, but as soon as I scroll up or down the document, the screen rewrites the new text over the existing. Resulting in totally unreadable black blobs after only a few movements of the cursor.
Anyone got any ideas what may be causing this. My PC is running WIN 98.