1.Instead of Adobe Reader, you can try Foxit Reader (Free and LightWeight)
2.Install Dameon Tools Lite, If they Need any Virtual drives for gaming Etc. (Free)
3. 7zip (or Any other Zip/unzipping Software). Almost a must.
4. CDBurner XP(http://cdburnerxp.se/)
(Freeware to Burn Cds/dvds/Blurays)
5. If needed you can install a PDF printer, CutePDF (Freeware)
Hop this helps