What is the system requirement
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The operating system should be Windows 98(SE)/ME, Windows 2000, Windows XP,Windows 2003, Windows Vista, Windows 7.

If you want to view xls, xl, xlt, ppt, pps, pot, doc, dot files, you need Microsoft Office, and for vsd files, need MS Visio.

If some vedio files or music files can not be played, may be you need to download some decoders such like "K-Lite Codec Pack" , you can get it from:
http://www.free-codecs.com/k_lite_Mega_codec_pack_download.htm