Hi AnariAjnabi,
This one needs some registry updates, as this problem is caused by some corruption in registry, mostly when office is removed or reinstalled but less likely when office is updated but now
click here and follow up with steps,
REMEMBER to backup your registry before you start, as this procedure although very simple is irreversible and may lead upto reinstalling the OS, if not followed properly, Good Luck.....chow
Mickey Mair