Windows XP & Roxio Retrieve 7

I saved 24.8 GB of data spanned across 6 SL DVDs using Media Creator Basic DVD Home 7.1.0.136. I was having alot of problems retrieving the data as about every 4th file, there was an error. I read some forums about diabling DEP in xp, so I did that. It works a little better now; however it’s incredibly slow. It’s been running for about 4 hours and copied 40 files that are an average .mp3 size. Errors still occur but are less frequent. I tried re-installing the s/w. After I backed up the data, I reformatted all my drives and reinstalled xp with all patches and SP2. The rest of my specs are

WinXpPro
AMD Athlon 64 3200
Corsair matched 512 mem mods @ 400
LaCie DL DVD R
et al…

I would appreciate anything from anybody that would lead to the restoration of my lost data

Thanks