Or you can just start typing Device Manager in the Search box but, it'll pop up on the Start Menue before you finish typing. Toshiba laptops (most laptops, actually) don't come w/ Recovery discs... the End User is supposed to burn them as part of the intial set-up (of a new machine) and before starting to use the computer. There is, however, 1 way around this roadblock... get your hands on a Windows 7 disc & never mind Repair, do a Clean install... pull any "I want to keep it" data off the HDD 1st, of course, if you can... anyway, when it gets to asking for the Key, use the 1 on the OS label affixed to the bottom of your laptop. This will bbe a lot better,quicker & more of a sure bet than mucking about trying to 'fix' the present mess that you have.
Oh, & though you gave no specifics, if you are or were downloading from some P2P site (utorrent, bittorrent or whatever) do not do that anymore.
If you rebuild use MSE & IE9, just an educated recommendation, not an order
Cheers,
Drew