pravesh

in my pc some software are not install but when we going to install to message showing it already install. What I do?
my pc information
windows 7 ultimate
processor-intel® Core i3-2330M CPU @ 2.20GHz
RAM- 2.00GB
System type- 32 bit
 
Operating system:Windows 7 Ultimate (32 bit) Service Pack 1
System root: C:Windows
Available physical memory: 1894 MB
CPU: Intel® Core i3-2330M CPU @ 2.20GHz
Drive Info:
C: 39.88 GB
D: 212.89 GB
E: 212.89 GB
Internet Explorer: 11.0