The iPad cannot run Windows applications it can only run apps specifically written for it. There is an iPad app, VMWare View for iPad, which connects to a Windows system and allows the user to use Windows applications via the iPad.
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If you wish to run Windows 7 or earlier on an iPad, it is impossible because the Apple A4 (first-generation iPad), A5 (iPad 2), and A5X (third-generation iPad) processors are based on the ARM processor architecture, while Windows is designed to run on processors based on the x86/x64 architecture. However, the upcoming release of Windows 8 accompanies another version of Windows called Windows RT, which is specifically designed to run on ARM processors, so, theoretically, it may possible to run Windows RT on an iPad.