unable to cast COM object of type 'microsoft.office.interop.word.applicationclass' to interface type

[aussiejj]

unable to cast COM object of type

'microsoft.office.interop.word.applicationclass' to interface type

'microsoft.office.interop.word._application'. this operation failed because the QueryInterface call on the COM compnent for the Interface with IID  '{0020970-0000-0000-C000-000000000046}' failed due to the following error: The RPC server is unavailable (Exception from HRESULT:0x800706BA).

cant seem to launch word

the above error conde happens when i try to launch "new letter email template"

have tried fixes mentioned in another post with some similarity

word 2007 wont work when iuse the template, different error code 

"Attempted to read or write protected memory. This is often an indication that other memory is corrupt

pretty much cant use word with act and right now i absolutely have to

anyone help???????????

[benhamilton]

I try this KB first: http://kb.sagesoftwareonline.com/app/answers/detail/a_id/24256/

and failing that, try these: 

http://kb.sagesoftwareonline.com/app/answers/detail/a_id/24350/

http://kb.sagesoftwareonline.com/app/answers/detail/a_id/33143/

http://kb.sagesoftwareonline.com/app/answers/detail/a_id/21040/