Thought I'd upgrade to the latest version. Bad mistake. Running Vista Ultimate (upgraded from Home Premium) on an HP dv9230 laptop with Office 2007 and Norton 2007 installed. The install kept failing - said it was 'interrupted.' By what? The installer was notoriously uncommunicative, about what interrupted it and what it was doing at the time. Just that ridiculous thermometer bar. Anyway, uninstalled the prior version, no change. Kept retrying, rebooting and retrying. Finally it went...about an hour ago. Then on the mandatory reboot Windows STOPped. timntr.sys missing or corrupt. Booted Vista Installation from my USB drive and got to the command prompt, copied the timntr version 22.214.171.1243 to the windows\system32\drivers and then got another STOP for the snapman.sys file...copied version 126.96.36.1993 and it succeeded in booting. Hmmmmm...I may have figured out the cause...I keep a particular folder in "Documents" and my local "Temp" folder encrypted with EFS. Apparently the installer uses the local Temp folder and upon moving the files to \Windows\System32\Drivers the remained encrypted. I'll test that tomorrow when time permits. What bothers me is the fact that it would not install and kept rolling back and giving me no clue whatsoever as to what the problem was. This is unacceptable. I'll go in with Process Explorer tomorrow and see what I can discover.