[http://www.ifixit.com/Guide/Installing+Dell+Inspiron+5100+PP07L+CD+Drive/5632/1|THIS] guide appears incorrect. You don't need to disassemble the laptop to remove the drive. There is a quick release in the memory compartment refer the [ftp://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-1100_service%20manual_en-us.pdf|Manual]
There is at least 1 other Dell guide showing the same incorrect disassembly method.
[http://www.ifixit.com/Guide/Installing+Dell+Inspiron+5100+PP07L+CD+Drive/5632/1|THIS] guide appears incorrect. You don't need to disassemble the laptop to remove the drive. There is a quick release in the memory compartment refer the [ftp://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_inspiron_laptop/inspiron-1100_service%20manual_en-us.pdf|Manual]
There is at least 1 other Dell guide showing the same incorrect disassembly method.