My PC is on Vista Home Basic and I wish to uninstall and reinstall this operating system. However I have lost the Installation Disc but have theProduct Key 25 digit ref. Can you supply a replacement disc to enable such an operation to go ahead. Thank you. Bob Sirett

You'll need an installation disk, but why would you want to invest the time and effort with Vista. Upgrade to Win7 instead (stay away from 8).

To reinstall put the installation disc into the computer and restart. Tap f12 while the bios is loading and select boot from disc. This will allow you to reinstall. Otherwise go to http://www.password-changer.com/ and make a bootable disc. This disc will allow you to clear the password from your machine.
If you have more questions feel free to ask me.

Install the Audio drivers compactible with windows Vista home basic by going to the manufacturers website.
Go to device manager and check if the driver is installed if they are then uninstall them and then reinstall them by downloading the latest drvier from the computer manufacturers website

if you have a boot cd for vista home then put the disc in drive - go to boot screen and change the boot order with cd/dvd-rom priority on top and go for the installation where you can format your system and install a fresh copy of Vista home. make sure you have a bootable disc of vista home

Usually the operating system is on a separate partition especially for reinstallation when things go pearshape.

Some models used the SHIFT 0 when booting up to get to the windows installation. If you have deleted ALL partitions and reformatted then you have a real problem. Call DELL if you have not deleted partitions and find the specific s]sequence of accessing the partition for your model.

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If you purchased a computer with an installation of Microsoft Vista you would normally have a recovery partition. On restart continually press F8 to go to the advanced boot options menu and choose Repair your computer. If it would ask for language preference choose it. Then if it would ask for administrative access go ahead and login. On the next menu choose the image restore for your system. If you have a dell it would be Dell Factory Image Restore. It would depend on the brand.

If you installed vista separately. You would need to boot up your Vista Home Basic Disc. Place the disc in the drive and restart. It would normally load your disc if it is set as primary boot. If it did not enter the BIOS then change your boot sequence to start with the Optical Drive first or you could press the key for boot selection. some would press F10 or F11 for that, but you can find it when you boot up your computer. It would be stated on the starting sequence or the bios splash. Press that key and choose your Optical drive/CD/DVD drive. Then follow the instructions on reinstalling your Vista Home Basic.

You were got drivers disc with your PC.Insert the disc in CD-ROM drive and install the graphics driver to get better resolution.
If you have lost the graphics card then change the card and reinstall it by given above example.

You cannot uninstall Windows Vista, but you can reinstall your previous operating system, which then replaces Windows Vista. To reinstall your old operating system, you must have the original installation disc. Back up your programs and files, insert the installation disc into your computer, and then reinstall the old operating system. To regain the hard disk space used by Windows Vista, reformat the disk during the reinstallation process. After reinstalling your previous operating system, reinstall your programs and files.

More information is here:
http://support.microsoft.com/kb/978788

You may want to consider upgrading rather than downgrading.

uninstall the office suite (the trial one also) since it sounds like its corrupted and reinstall the one you purchased. Im assuming you have the install disc...