The Dell Recovery Partition (CTRL/F11 at initial boot up on XP systems) will restore the PC to the original factory condition. If it worked originally without problems it will work without problems after the reinstall (assuming there is no hardware problems). But, before you do the restore, save your user data, e-mail address book, etc to some other media (CD's, USB drives external hard drive) as the PC restore will erase the hard drive before reinstalling everything.
Dimension E510 with D925 CPU and Vista Home Premium 32 bit
Home Built PC with Q6600 CPU, 8GB RAM, HD4850 Video, HTO Striker 7.1 Audio Card - Windows 7 64 bit Professional
Sonar 8.5.1 ( Producer) DAW Software/Focusrite Saffire Pro 40 Recording Interface and Frontier Tranzport wireless controller.