In a message dated 11/24/98 12:21:17 AM Pacific Standard Time, [log in to unmask] writes: << I have the same kind of problem with a new built machine. The only common point is the hard drive (WD) and the Operating System. (PII 333, 16 mb) When I chek in My Computer...then, properties.... Performance Tab, it say <Compatibility mode paging reduces overall system performance > then <drive c: using MS-DOS compatibility>, the same message appears for all the drives (including CD-ROM drive). Then on the Device Manager tab, there is a yellow exclamation mark under the title <Hard disk controller> beside <primary ide controller (single FIFO)>. So what to do? Thank you. Fabio Di Tomasso >> Fabio: I had the same problem as well. Win95 233 mhz 2.1gigHD. Turned out I had a virus. When I clicked on details under that dos mode message it said that the mbr had been changed. After running Norton AV v.5 it found several viruses, cleaned them out, and I was back to "optimal performance". HTH Kevin Nowicki PCBUILD's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>