Hello, I am having similar problems like this user is having in this link: http://en.community.dell.com/support-forums/laptop/f/3518/p/19465965/20185627.aspx My USB 3.0 ports are not working with any USB, but my 2.0 port is working correctly.

The issue could be due to an application or a driver as the system runs properly in Safe Mode and with services disabled in Normal Mode. Vostro 430 supports DDR3-1333MHz PC3-10600 modules and the Crucial modules seems to be compatible as per the information provided on their website.

I am using Dell Inspiron 15R. My wireless adapter is Dell Wireless 1702 802.11b/g/n. I am having issues regarding network speed. My drivers are up-to-date.