My laptop model name is compaq preserio c700 (c772tu), Installed windows 7 Os after intallation it seems some error like driver compatibility error for display mobile intel (r) 965 chipset exprees ) could you advise me how to rectify it and sometimes take more time while booting OS..........thanks in advance.

Please follow these steps..
Download the drivers for "display mobile intel (r) 965 chipset exprees". Unzip it. then open the folder. Navigate to the .EXE file (or setup.exe) for the program. Then...
Right click on the program file (the .EXE or .COM file).
Select Properties from the menu that pops up (#1).
Select the Compatibility Tab in the dialog.
Change the options so the program opens in Windows 95 or 98 compatibility mode.
Note the other options in the dialog as you may have to experiment a bit and change some of them as well (#2).
If this doesn't work, then try checking the "Run the program as an administrator" box (#3).
This defeats the security in Windows Vista however and should be a last resort.
Hope this works...