Freezing just after log on

Working on a Toshiba, windows 7, 64 bit, home premium. After the type in username and password screen, it logs on normally, loads the desktop (and other junk programs that I will remove when I get access), then all but mouse just freezes solid after about 2 minutes. It also does this in safe mode, when safe mode boots. I cannot boot to safe mode with networking, last known config does not work, but I can get to safe mode with command prompt. The cmd prmt window comes up and is useable, but the safe mode screen behind it is blank with only 'safe mode' in the corners. So, in conclusion, I can boot the pc, but only have about 2 minutes to execute anything. The cmd prompt seems to do okay. I have used a win7 boot cd with no fails on memory diag or no good on start up repair, system restore says no restore points have been created. They did not provide me with any cd's with the laptop. Wondering about fully recovery if fail to find any other options. Knoppix shows a few bad sectors on the drive, but I've seen that many times and not had this issue so bad. It also shows all files resing comfortably when the drive is mounted.

Thank for the tip. I will give it a shot. As of now, I have a few things I'm trying to execute quickly; rkill and iexplore for killing known infectious processes, updated versionof Malwarebytes .exe, successfully ran tdss killer and it passed, malware removal tool from MS. Keep the ideas coming. Thanks. I was thinking infection also, but some articles have hinted at faulty drive ( I really don't think it is too bad) and faulting MB. Infection seems to come to mind first. Also about forgot to mention, at one point when trying to boot to safe mode, one time i got a message across the screen like when windows is shutting down, it said 'preparing security options.' One article I read hinted that at infection.

In addition test the HD with maker's HD Diagnostics, then the RAM with memtest86. Everything you need including including to rescue files plus more is on Hiren’s BootCD 15.1 or Hiren's BootCD From USB Flash Drive (Pen Drive) » www.hiren.info

Then run a few Startup Repairs to see if it finds anything to repair. If not manually run SFC /SCANNOW Run in Command Prompt at Boot.

Thanks Greg, I'll check the the hdd diagnostics and memtest86. I have run start up repair a few times with no prevail. SFC was run and checked okay.

If this is still the bloated Toshiba preinstall I would strongly consider getting the vastly superior Clean Reinstall - Factory OEM Windows 7.

At the minimum I'd want to Clean Up Factory Bloatware

Luckily the guy said he HAD made a back up a while back before it was crazy. He said no prob to just recover the system to out of box. hope that works. thanks for all the advice.