TY  - GEN
AU  - Preppernau, Joan
AU  - Cox, Joyce
TI  - Windows 7: step by step
SN  - 9788120341166
U1  - 005.432 
PY  - 2010///
CY  - New Delhi
PB  - PHI Learning
KW  - COMPUTER SCIENCE
KW  - MICROSOFT
KW  - OPERATING SYSTEMS
KW  - SYSTEM SOFTWARE
ER  -