You've had 3 different bsod's in one day. That typically points to either malware or hardware failure. Let's try some basic steps:
1) Please run full system scans with BOTH your installed anti virus app and with MalwareBytes
2) To check the ram, download memtest (
http://memtest.org/). Burn it to a cd using a dedicated .iso burning utility (
http://www.petri.co.il/how_to_write_iso_files_to_cd.htm), make sure the cd drive is at the top of the boot order in bios, then boot to the newly created cd and run the utility.
3) Hard Drive Diagnostics:
http://www.tacktech.com/display.cfm?ttid=287 Make sure you select the tool which is appropriate for the brand of your hard drive.
Depending on the program, it'll create bootable floppy, or bootable CD.
If downloaded file is of .iso type, use ImgBurn: http://www.imgburn.com/ to burn .iso file to a CD (select "Write image file to disc" option), to make the CD bootable.
For Toshiba drives, see here: http://sdd.toshiba.com/main.aspx?Path=ServicesSupport/FujitsuDrivesUSandCanada/SoftwareUtilities#diagnostic
Let's see where we are after these three troubleshooting steps.
