I'm sorry for digging up this post. But after having read many threads on the 0x80300001 error, I'm still confused. Did I get it right: the cause is an iso larger than 4.3Gb? I have tried to accomplish the following: - Slipstream Vista Home PE SP1 Eng. x64 with: + German language pack + All updates post SP1 + Current Ati Catalyst Vlite produced a 5.6Gb large iso, burned to DL DVD. I also recieve the 0x80300001 error on install. Is there anyway to accomplish the above and get past this pesky error? Help is much appreciated - I'm lost