This model and Operating System is not supported by Dell.
Recommended hardware Upgrades
As this system has an IDE hard drive interface which is obsolete its not recommended investing much time or money in upgrading this systems hardware and software.
It is recommended 2 GB of RAM to be installed.
Refer to the Service Manual when performing hardware upgrades.
Right click and select properties and run in compatibility mode for Windows Vista.
See Installing the Windows XP version of Dell Quickset in Windows 7 32 Bit.