filename.doc is blocked from opening in this version

Do you still have the discs from the previous version? You may be able to delete the new version and go back. Others on here will know for sure.

What version/year of Microsoft Office do you have currently installed? 2004, or 2008? Is it fully up to date? When you select Check for Updates from the help menu, are any updates listed? Have you tried saving the document to the computer and then trying to open it?

ClaireDa said:

I ran Mackeeper and it updated it, and since then I haven't been able to open any downloaded files.

Click to expand...

Delete MacKeeper. It's useless and can cause problems. The most effective method for complete app removal is manual deletion:

You don't need "cleaner" or "maintenance" apps to keep your Mac running well, and some of these apps can do more harm than good. Some can even degrade, rather than improve system performance.

Some remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process. These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space.

Some of these apps delete caches, which can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt. Caches exist to improve performance, so deleting them isn't advisable in most cases.

Many of the tasks performed by these apps should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance.

Mac OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.