The best Microsoft Office compatible suite that I use on my own work laptop is the Kingsoft Office 2007 Free Personal suite version.
It is compatible with Microsoft Word, Excel, and Powerpoint:
http://phanmem.dec.vn/ProductDetails.aspx?ProductID=23
The installation file is stored in a zip file so you will need a program like Winzip or ExtractNow (which you can get from www.download.com) to unzip the file and extract the installation program for the Kingsoft Office 2007 Free Personal Edition.
I use the Kingsoft Office 2007 Free Edition suite on my own work laptop mainly because the menu interface for this suite is similar to Microsoft Office 2003 and so I find it easier to use.
Here is a website that gives more information about the Kingsoft Office 2007 free version:
http://www.instantfundas.com/2008/09/kingsoft-office-2007-free-personal.html
…and then there is also the free Softmaker Office 2006 which is compatible with Microsoft Word and Excel:
http://www.softmakeroffice.com/
Good Luck and I hope one of the above office suites will meet your needs!