I was just clearing some stuff off my comp yesterday to make some space, and I found a "Downloads" folder in my "Favourites" folder. I thought it was just a shortcut, so I deleted it and then found it deleted everything in my actual downloads folder and I'd already emptied the recycle bin.
I did a System Restore and it got my downloads folder back and everything in it, but I think it's messed up some installer stuff. I downloaded the latest Second Life update and tried to install it and I get the error "NSIS Error writing temporary file. Make sure your temporary file is valid".
I only get the error with this version of Second Life though. I can install the previous version. Other errors include some "Windows Installer" errors saying "The Windows Installer service cannot be accessed", or some programs like Google Earth do nothing when I try to install them.
Some programs install, others give me these errors.
Tried searching and downloading and reinstalling Windows Installer 4.5 and did the misexec.exe /unregister thing in cmd that's on the Microsoft website, but still nothing.