It is unlikely to be a conflict between Windows 7 and Office 2010 - they are completely compatible.
Do you have a good anti-virus installed, with up to date definitions?
As a belt and braces measure, you could download Malwarebytes (free) and perform a full scan: Malwarebytes Anti-Malware - Free software downloads and software reviews - CNET Downloads
If all is clear, then you could try a repair on your MS Office: Office 2010 - Perform Repairs
Please post back with any results.