I have some problem I have encounter are any connected mass storage device stalk the boot up time and unable to use virtual drive to read disc image. Also I am using wireless module 802.11g, and it is no longer use as an access point (transmitter).
Prior to migrating to Windows 7 did you run the Windows 7 Upgrade Advisor?
To determine if your current computer configuration will be compatible with Windows 7 please go to the following link: http://tinyurl.com/no4xb7
Another resource to verify compatibility is available at the Microsoft Windows 7 Compatibility Center located at the following link: http://bit.ly/1gW6Ns and can be used for both hardware and software concerns.
"Also I am using wireless module 802.11g"
What is the make and model of this component? I was able to find Win7x86 and Win7x64 drivers for my D-Link USB 802.11g by reading this site - many 802.11g links use ralink drivers.