I have 3 computers that were all loaded with the same versions 98 SE and am in the process of upgrading each to XP Pro. ( I need to upgrade vs clean install, I know but I have my reasons ) Each unit is P4 1.6 Intel mobo D850GB all with the latest BIOS. Similar set-ups in each unit. The install went cleanly on 2 of 3 units. The last one ( which has been acting server through a windows network for my business software) will not load XP. Right after you enter the product code and it goes to the web for the updated setup files it comes up with Error cannot copy mfc42.dll with the only option of OK then Error cannot copy migisol.exe , again only option OK then about 2 minutes later a critical error note and code 599FF5CH ( also one time got EFFF5CH ) and then setup cancels. I've searched high and low without success. Some searches said it was a hardware or BIOS problem. I believe I can rule that out. I removed the drive and plugged in into one of the other computers with the same results. All the following but not in order.... I also went to the Windows update page and downloaded and installed all updates ( 98 SE ) I tried reloading the software. I tried renaming mfc42.dll to mfc42.old and got a new copy off the web without success. I removed the entries from the registry ( on a prayer ) still no luck. I ran system file checker, tried selective startup bypassing files, tried various registry repair programs though i didnt get the full registered versions ( I will if I knew it would fix my problem ) I've followed all the instructions in the pre-updated reports that comes on the disk. I really need to upgrade it vs clean install. The software I use for my shop that is installed is licensed but the company is no longer around. If I clean install I lose it then it would only be a trial version and would terminate after 30 days. ANY HELP :cry: would REALLY BE APPRECIATED, THANK YOU!