Goto Start > Click on Run > Type msinfo32 and press enter key ,you will come to know about system summary and also service pack..
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You can determine it by running DXDIAG (directx diagnostics) by typing dxdiag into the search bar. The opening screen of DXDiag will show the version under the classification "Operating System"
If it says SP1 under Operating System, then service pack is installed. If it doesn't (like this one doesn't) then it isn't.
If your DVD installation disk is prior to Sp1, and you have SP1 installed on your computer, you will need to uninstall SP1 to complete the in-place upgrade and then reinstall the necessary windows updates .
If you would like to perform the In-place Upgrade, let's refer to the following steps.
1. Start the computer by using the current Operating System.
2. Insert the Windows Vista DVD in the computer's DVD drive.
3. Use one of the following procedures, as appropriate:
• If Windows automatically detects the DVD, the Install now screen appears. Click Install now.
• If Windows does not automatically detect the DVD, follow these steps:
a. Click Start, click Run, type Drive:\setup.exe, and then click OK.
Note Drive is the drive letter of the computer's DVD drive.
b. Click Install now.
4. When you reach the "Which type of installation do you want?" screen, click Upgrade to upgrade the current operating system to Windows Vista.
Please run Windows Update again as you will need to download and install the most current updates.
If you do not have the Windows Vista Installation DVD, I suggest contacting your PC manufacturer to order a backup disk.
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