Dell Optiplex 745 64 bit Windows 7 Upgrade
I upgraded the Optiplex 745 from 32 bit Windows XP Professional to 64 bit Windows 7 Professional. I also upgraded the hard drive from an 80 GB to a 1Terabyte hard drive.
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Link to drivers http://ftp.dell.com/Browse_For_Drivers/Desktops/Optiplex/OptiPlex%20745/#Audio
Other links of interest to 64 bit upgrade.
http://www.howtogeek.com/228042/how-to-switch-from-32-bit-windows-10-to-64-bit-windows-10/
https://technet.microsoft.com/en-us/sysinternals/cc835722
https://technet.microsoft.com/en-us/library/dn482072.aspx
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