2007 is not working correctly and has conflicts with MSAntispyware

too many problems to list separately but an example is that if I click on MS
Antispyware it launches the Office 2007 Beta 2 installer. Windows One Care
has stopped working and Excel will not launch - gives an 'error 1317 cannot
icreate the folder C:\ProgramFiles\Microsoft Office' message. Running a
repair fails as the installtion file cannot be located. Microsoft Beta Client
is also not working and again clicking on it launches an installer. Norton
programmes are also not working and say the Trialware period has expired
-whereas it is only a few months into the subscription. Windows One Care
also told me its subscription had expired but it is not relevant. Networking
is also lost to my other computer but internet access using FireFox is OK.
IE & beta 3 will not launch ... I guess its a reformat job but any ideas
that could avoid it would be appreciated.