does this have PIC express slots?

Yes, they have a single PCI Express slot.

Will 64 bit computer run 32 bit programs reliably?

Absolutely. I have seen no issues. If you have something very unique then maybe but I have seen zero issues in many years over many systems in many different environments.

Questions & Answers: Refurbished: DELL Desktop PC OptiPlex 760 2.66GHz 4GB 250GB HDD Windows 7 Professional 64-Bit

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DELL Optiplex 760 [Microsoft Authorized Recertified] Desktop PC with Intel Core 2 Duo 2.66Ghz, 4GB RAM, 250GB HDD, DVDRW, Windows 7 Professional 64 Bit

Dual Core CPU Power
Intermediate 4GB Memory and 250GB Storage
Front and Rear USB and Audio Ports
Keyboard and Mouse Included

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