Hey guys, had a problem with Windows 7 on my laptop (Acer Aspire 7720G if it helps at all) and I was wondering if I could get some help. Basically, I installed Windows 7 Ultimate (32 bit) on my laptop last week, having purchased an upgrade download, and it was working great up till yesterday... I have no idea what happened, but it just switched itself off and when I tried turning it on again, it came up with a message saying LogonUI.exe - Bad Image. This comes up before it reaches the log-in page so I can't do a great deal. Same thing happens if I try running it in Safe Mode. I've been trawling through the net for solutions, and I've tried to reinstall Windows 7 from the DVD I burned it onto, but it comes up with "Error code 0x80070017", saying that it can't be installed. Tried a system restore too, had no luck with that either. Any help with this would be hugely appreciated, thanks!