Install of Nero 6, incl w/ Memorex 16X Ext DVD Rec, corrupted all DVD drivers on Dim 5150

I have a problem with my Dimension 5150/E510 which has the Sony DVD Drive, an additional DVD Int Drive I added and an Memorex 16X Ext DVD Recorder.  I have been using the Memorex 16X Ext DVD Recorder for over a month without problems.  I tried recording to this ext drive with the Nero SW that came with my Dell system and the SW would only work with the Sony DVD.  I attempted to install the Nero 6 for the Memorex, but it wouldn't install w/ the Nero 5 and I was instructed to remove.  I removed Nero 5 and installed Nero 6 package.  When I rebooted, the computer did not see any DVD drives.  When I when to device manager, all the drivers for the DVD were marked with an alert.  I removed and when I attempted to reload, I received a message that stated the drivers were corrupt.  Any suggestions on fixing this problem would be appreciated:

 

System configuration as shipped from Dell in 2/2006:

 

Quantity Parts # Part Description

 

1 - W8400 - PROCESSOR, 80547, PENTIUM 4 PRESCOTT DT, 630, SKT-T, MALE

1 - UD838 - BASE (ASSEMBLY OR GROUP), MATRIX,SMITH,MINI TOWER, PENTIUM 4 PRESCOTT DT, 630, 5150/E510

1 - 54981 - MODULE, INFORMATION, NOSPEAKER

1 - 55956 - MODULE, INFORMATION, NO MODEM INCLUDED

1 - 90729 - MODULE, SOFTWARE, INFORMATION, NEW TECHNOLOGY FILE SYSTEM

1 - N2313 - MODULE, INFORMATION, SOFTWARE, INTERNET SERVICE PROVIDER, AMERICA ON LINE, DELL AMERICAS

ORGANIZATION, PUBLICATION

1 - C8586 - MODULE, SOFTWARE, WINDOWS MEDIA PLAYER, 10

1 - C9848 - MODULE, PANEL, NO-FD, 5.25" FORM FACTOR, MATRIX,SMITH,MINI TOWER, DIMENSION

1 - CC224 - MODULE, DUAL IN-LINE MEMORY MODULE, 256, 533, 1R, NON ERROR CORRECTION CODE

1 - CF076 - SHIP GROUP, MATRIX,SMITH,MINI TOWER, 5150, UNITED STATES, NORTH, ENGLAND/ENGLISH, DELL AMERICAS ORGANIZATION1CF565MODULE, BADGE, MATRIX,SMITH,MINI TOWER, DIMENSION, 5150

1 - G0344 - MODULE, KIT, COMPACT DISKETTE, AOL8.0, BUDDY ROM, DELL AMERICAS ORGANIZATION

1 - DC519 - MODULE, SOFTWARE, SONIC DIGITAL MEDIA, V7, LOW ENCRYPTION, DELL AMERICAS ORGANIZATION

1 - DG502 - MODULE, SOFTWARE, MUSIC MATCH, 10.1, ODP, BASIC

1 - F6405 - MODULE, INFORMATION, NO RAID, DIMENSION

1 - H8457 - MODULE, MOUSE, UNIVERSAL SERIAL BUS, 2BTN, ENTRY, LEAD FREE, DIMENSION

1 - HD756 - MODULE, SOFTWARE, WORDPERFECT, 12, PLUS-TRIAL

1 - G4150 - MODULE, COMPACT DISK READ WRITE/DIGITAL VIDEO DISK DRIVE COMBO, 48X32, DIMENSION, SECOND

1 - JC663 - MODULE, LABEL, MICROSOFT, WINDOWS XP, DESKTOP

1 - JG088 - MODULE, SOFTWARE, PAINT SHOP PHOTO ALBUM, 6.0, STANDARD, ENGLAND/ENGLISH, DELL AMERICAS ORGANIZATION

1 - K1609 - MODULE, SOFTWARE, INTERNET SERVICE PROVIDER, REM-MSN-ICON

1 - K2967 - MODULE, INFORMATION, SOFTWARE, INTERNET SERVICE PROVIDER, AMERICA ON LINE, DELL AMERICAS ORGANIZATION, ASSET RECOVERY BUSINESS

1- K2972 - MODULE, INFORMATION, SOFTWARE, INTERNET SERVICE PROVIDER, AMERICA ON LINE, PRI-OOBE

1 - K7257 - MODULE, SOFTWARE, WXPHSP2, COMPACT DISK DRIVE, ENGLAND/ENGLISH, DAO/BCC

1 - KD341 - MODULE, SOFTWARE, DSPRT3.1, GTECK0, DIMENSION

1 - N2307 - MODULE, SOFTWARE, INTERNET SERVICE PROVIDER, OOBE, CUSTOMIZATION

1 - N6174 - MODULE, SOFTWARE, IMAGE, RESTORE, DIMENSION

1 - N7965 - MODULE, SOFTWARE, WXPHSP2, DIMENSION, ENGLAND/ENGLISH, NO DOCS/DISKETTES, DELL AMERICAS ORGANIZATION

1 - N9575 - MODULE, SOFTWARE, QUICKBOOKS, 2K5, SPCL-SSE

1 - P4259 - MODULE, KEYBOARD, 104, UNITED STATES, LEAD FREE, NMB, DIMENSION

1 - P7167 - MODULE, SOFTWARE, POWERDVD, 5.5, DIMENSION

1 - PH652 - MODULE, SOFTWARE, INTERNET SERVICE PROVIDER, INTERNET, SEARCH, UNITED STATES, TRANSACTIONAL LINE OF BUSINESS

1 - R1494 - MODULE, SOFTWARE, INTERNET SERVICE PROVIDER, EARTHLINK, DELL AMERICAS ORGANIZATION

1 - R7823 - MODULE, HARD DRIVE, 80GB, Serial ATA, #1, GENERIC, DIMENSION

1 - TG017 - MODULE, SOFTWARE, MCAFEE, 7, 90DAY, ENGLAND/ENGLISH, TRANSACTIONAL LINE OF BUSINESS

1 - U2001 - MODULE, INFORMATION, INTERNET SERVICE PROVIDER, AMERICA ON LINE, PRI-OOBE, SMALL AND MEDIUM BUSINESS

1 - WF355 - MODULE, SOFTWARE, GAMING, ICON, DELL AMERICAS ORGANIZATION, ENGLAND/ENGLISH, SERVER MANAGEMENT BUS

1 - Y5679MODULE, SOFTWARE, Adobe Acrobat, READER, 6.0