Office 2007 files will not open

Hi..
I am Dipu Michael from India. I am using the software office2007 in windows7.For the checking purpose I installed 0ffice 2003 in my system. After my requirement I uninstall the 2003 version. From there onwards I facing a problem in opening the office files like word, xls etc. It take more time to open the file. First it run the setup files and then finally open the required file