Hello Shawn/Brink, I am trying to download sp1 on my 32-bit vista home premium, but keep getting error code 0x800B0100 ... long story short, I am now running Check Disk to fix errors on my hard drive. I've followed your instructions above and tried methods 1, 4 and 5 and restarted my pc immediately, but absolutely nothing happens. How would I know if my pc is scanning or repairing errors on my hard drive when my pc turns back on? If I'm missing something, please let me know in full details because I'm a complete computer noob. I'll assume your response will be posted at the end of the last page, so that's where I'll be. Thanks in advance.