Without knowing what "some other things" are, it sounds like something got corrupted with that uninstall of Virtual box (which loads virtual networking components that interface with your network hardware). I would try a System Restore to a time previous to this, when it worked, and try uninstalling again (and reboot after uninstallation).
Or it could be an issue with those other things you uninstalled/changed. What were they?
System Manufacturer/Model Number Hewlett packard/p6512uk OS Microsoft Windows 7 Home Premium 64-bit 7600 CPU IIx4 amd athelon 635 processor Motherboard FOXCONN 2AA9 Memory 2x2gb Graphics Card ati radeon HD 5450 Sound Card (1) Realtek High Definition Audio (2) AMD High Definition Monitor(s) Displays samsung lcd tv 32" Screen Resolution 1360x 768
Keyboard wireless hp Mouse wireless Hp,optical PSU ? Cooling air! Hard Drives (1) WDC WD10 01FAES-60Z2A0 SATA Disk Device (2) Maxtor OneTouch USB Device (3) ST310003 33AS USB Device (4) WD My Book 1111 USB Device Internet Speed 1.10mb/s Antivirus MSE Browser Firefox
Network icon in status bar showing not connected? problems?