tvandersluijs - I'm sorry if that screwed up your machine however: 1. What version of Adobe Reader are you using because as you can see the registry entry is for Adobe Reader 9, if ur using Adobe Reader 8 then u need to specify ur version as PAllens entry suggested - "E.g. "C:\Program files\Adobe\Acrobat [version]\Reader\AcroRd32.exe"" 2. I've used this solution significantly because I have come across this specific issue for multiple users. 3. All the registry entry does is tell Windows what program to use by default to open/view PDF documents. My intention wasn't to screw up ur machine or anybody elses as I said I've used this solution many times however what I've should gave is the disclaimer to backup ur registry before u make mods so u can revert back in case. Also the ony other thing I can think of is that this solution was for Windows XP using registry editior 5, I'm noticing that the title of this thread is Windows 7. ... View more

I have this issue several times on various users PC's. What I've done to resolve is the following Registry import: 1. Create a .reg file using Notepad 2. Copy the following in document (all in between the hashmarks) or use registry doc i attached to this response -------------------- Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\acrobat\DefaultIcon] @="C:\\Program Files\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\acrobat\shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\acrobat\shell\open] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\acrobat\shell\open\command] @="C:\\Program Files\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe /u \"%1\"" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\SOFTWARE\Adobe\Acrobat\Exe] @="\"C:\\Program Files\\Adobe\\Reader 9.0\\Reader\\AcroRd32.exe\"" ----------------------- 3. Save as something like AdobeFix.reg 4. Run regedit and import this entry into your registry then restart PC. ... View more