Ok...I'm running a AMD T-bird 1.2ghz not overclocked... on a Asus A7V133 with 320megs of pc-133 ram, a Maxtor Diamond Max PLus 30gig HDD and a Western Digital WD Caviar 20gig HDD. Nvida Geforce 2 Ultra, Guillemot Isis Maxi Studio sound card.... all on good old WIN98SE. Now problem is I load 4in1 drivers version 4.26 and the ATA 100 promise drivers , I have bios 1006 loaded all the latest drivers are on this machine....Not up more than a few hours at best, very unstable and on a normal reboot (after many reboots later) I get this message saying these files are missing or damaged: DDEML.DLL MCICDA.DRV. WINASPI.DLL. I have tried everything I can think of ...Just after a few hours BAM I got no o/s no safe mode no nothing I get that wonderful Illegal operations screen and nothing, no icons on desktop, zelch... Reboot run scanreg /fix says it fixes it but same ole same ole !!! No desktop and Illegal Operations.... Help ! I will be stable for a few hours and I get this after rebooting.Also it seems when I do reboot I will get a message saying to run scanreg. that my registry is corrupt or has been changed??? I have not messd with my registry at all !! What the hell have I done or not done correctly ??? Any help?? Many thanks to those who reply !!