As other users suggested, it is perfectly acceptable to use Windows Vista drivers in any scenario where a Windows 7 driver does not currently exist. In most cases, the Windows Vista driver will prove to be sufficient. However, there still seems to be graphics troubles within your Windows 7 environment; it may be helpful to read the following Microsoft created Help and How-to Update a driver for hardware that isn’t working properly. You might also want to try to install the graphics drivers in particular within compatibility mode. You may want to download the latest Windows Vista drivers directly from Intel's Download Center which is available here.
For your convenience I have included the instructions for Compatibility Hardware Device Drivers by Microsoft MVP, Ronnie Vernon, from the TechNet forums below:
COMPATIBILITY HARDWARE DEVICE DRIVERS:
1. Place the driver installation file on the Desktop.
2. Right Click the driver installation file and select Properties/Compatibility Tab. Select the appropriate options in from the list. In your case, you would select Windows Vista.
3. Click Apply/OK.
4. Right Click the file and select the Run As Administrator option to install.
Windows Outreach Team -- IT Pro