I have two PCs with Office 2007 them, it was only my laptop that had the
problem; so it is not a fault with Microsoft. It is differcult to confirm
whether this is a virus but it is suspecious that that we have both had
identical problems.
You can buy Microcsope from
www.micro200.co.uk, but unless you are also into
PC repairs this is a lot of money to spend. It would be cheaper to purchase a
new hard drive as they are so cheap, it your PC does not have a very large
hard drive it will give you the opportunity to increase the storage at the
same time.
At least that way you are starting from a fresh system.
Also use Spybot after the installation as I have found that this is really
good.