Microsoft Office doesn't work anymore

A while ago I connected my macbook to an apple screen at work for a few hours. After that, I could not open microsoft excel on my laptop anymore. I therefore deleted microsoft office 2011, and installed in on my macbook again. Since then, I cannot open any micorsoft office programmes and in case I try it tells me that due to an error word, excel or powerpoint had to be closed. When I then click on further information about the error, for word it for instance tells me:

Microsoft Error Reporting log version: 2.0

Error Signature:

Exception: EXC_BAD_ACCESS

Date/Time: 2012-12-23 14:54:13 +0100

Application Name: Microsoft Word

Application Bundle ID: com.microsoft.Word

Application Signature: MSWD

Application Version: 14.1.0.110310

Crashed Module Name: CoreFoundation

Crashed Module Version: 476.19

Crashed Module Offset: 0x00016722

Blame Module Name: OfficeArt

Blame Module Version: unknown

Blame Module Offset: 0x00004749

Application LCID: 1033

Extra app info: Reg=en Loc=0x0409

Crashed thread: 0

I hope one of you guys can tell me which steps to take now.

Thank you in advance.

Lisa