I have l640 satellite toshiba laptop which comes with windows 7 but i have succcessfully loaded windows xp. everything runs well except sound

How much memory do you have in your Toshiba Satelite laptop?
Windows XP with Service Pack 3 needs a minimum of 1GB but ideally would run better with 2GB.

Windows 7 would need the same but there is no auto-update process to go from XP to 7 as this is not allowed - you would have to do a Custom install of Windows 7 which requires a clean install (i.e. format the hard drive and start from scratch).

If you are running XP with less than 1GB memory, then you need to check what the maximum memory that the laptop can be upgraded to?

The easiest method is to use the Crucial Memory web site System Scanner utility which will detect how much memory is installed and advise how much you can upgrade to according to the options available for the specific make & model of laptop.

If the laptop hasn't been turned on or on-line for a long time then you may be using a lot of resources downloading Microsoft critical updates plus updates for other installed programs like iTunes, QuickTime, Java etc.

Try downloading and installing a copy of the free Advanced System Care 5 utility then running the Deep Care tools which include System Optimisation and clean-up utilities to improve system performance.

The official Toshiba site
http://us.toshiba.com/computers/laptops/satellite/L640/available-models

Hi, to have a good answer please download from Microsoft webpage the program that let you check if your hardware is good for Windows 7.
You can download it here
http://windows.microsoft.com/en-US/windows/downloads/upgrade-advisor

your sound drivers from windows xp doesnt support windows 7 look up sound driver and trouble shoot buy right clicking it.

Make sure your video drivers are up to date as they can cause the blue screen. Click on Start/All Programs/ Windows Update. Click on Check for updates, once it searches for updates go through the optional updates and install any optional updates for your hardware like video, motherboard, sound, drivers ect.

As a last resort you can go to toshibas website and under support download toshiba drivers and install them.

Hello, make sure you install all your drivers...it sounds as if you haven't got the network device driver (lan) loaded..
Regards,
Nicam49

If it meets the requirements for Windows 7, put the disc in the drive. Reboot, and choose to "boot from cd/dvd drive" (should be one of the f key's, your bootscreen will prompt you on it. After you boot from disc, follow the windows steps for installation.

check the diver usage or change the partition

Windows 7 is a brand new OS from windows your webcam may not have a compatible driver for this version of windows as of now.

did you have the laptop/notebook from new if so then you should have had a set-up disc containing all of the drivers needed to activate items such as modems,sound card,graffics card etc.
this is just a simple problem and can be rectified instantly by inserting set-up disc and loading all avaliable drivers!
if no disc avaliable then log onto the toshiba website and download the up to date drivers needed for your laptop/notebook