I have a new computer, ordered through Dell, operating on Vista with Office Home and Student 2007 installed. I just purchased the computer last month. I have the disk and the product key is clearly printed. However, despite several attempts, I have received an error message saying that the product key is incorrect. This relates to Office, when I use Word, Powerpoint, Excel, etc. How can I solve the problem? Additionally, I am working abroad and and it is difficult to call Microsoft. Any online help would be appreciated.