no internet access and crashing applications (malware or csrss.exe)

Hello and welcome prakhar mate run this

USING THE KASPERSKY RESCUE DISK

Download the softwarefrom here http://support.kaspersky.com/4162 and make abootable disk or USB stick. Set the BIOS to boot from either the optical driveor the USB stick whichever you prefer I like the disk myself but the choice isyours.

Insert the disk andthen reboot and let the program run it will scan from the very start of poweron for malware that may be otherwise too well hidden. It also does not involve Windows as it runsalone - bootable.
If this gets things going run these

https://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

https://www.sevenforums.com/tutorials/433-disk-check.html < use the /f and /r options in Option2 if necessary

Nothing to lose prakhar but if you want to try these first

http://www.superantispyware.com/

http://www.malwarebytes.org/products/malwarebytes_free/

http://www.bleepingcomputer.com/download/adwcleaner/

download from bleeping computer – delete any rubbishthese find.

There is this Emsisoft Free Emergency Kit: Portable malware scanner | Free removal of Viruses, Bots, Spyware, Keyloggers and Trojans
and I usually only use the Emergency and Command line scans

if things are looking grim then the TDSS Killer at the top of the list
http://www.techsupportalert.com/best-free-rootkit-scanner-remover.htm

In any case I hope you have all data backed up just in case

Ok mate now an option for you would be this Clean Reinstall - Factory OEM Windows 7 it will be the very latest version "freshest" some call it of Windows 7 including the SP1 and it will not load all the factory bloatware therefore giving you more space and less annoying factory rubbish they put on store made machine shese days.
Just make sure you pick only the version of Windows that was originally installed and not a higher version - some do and end up with buckets of grief. All you need for this is the activation code on the sticker on your machine. Your data you can add later if you have backed it up and it is a good idea to do this Imaging with free Macrium I do it on a weekly basis and one last thing I always do a backup of the registry after a clean install or before I go changing the registry as one can do if you use the Optimise tutorial - it is very safe anyway but just in case you hit a wrong key you can always get back the original registry listing.
To do that see this Registry - Backup and Restore takes very little time to do and to optimize see this I do nearly everything on this tutorial and you will be amazed at the difference in performance
Optimize Windows 7

Post back on how you get on as I am interested as we have doe a bit together now and sorry I couldn't give you the answers:)

That's ok Prakhar if you like to keep the stuff - I don't personally as if it does not do anything really vital to the operation of the machine I like to get rid of it.
As a matter of fact my Toshibas have both been clean installed onto SSD's with an OEM and there is still some Toshiba rubbish that downloads with updates - how don't ask I haven't got a clue.

I am just wondering what the Lenovo features are that you like in case there may be an alternative that will not pester like some of the factory stuff does. By the way do you know the factory default key?? If not just Google the machine you have by typing
"factory restore button for a Lenovo *******" you should end up with replies as that that is and it is usually one of the "F" keys or a combo of one of those and DEL or others. For example my Toshiba factory restore key is the 0 (zero) number key on the top of the keyboard and not the NUM pad zero. Anyway the Google will tell you what it is.
Actually I did just that and you should get this How do I recover my factory installed programs and files? - Desktops and Workstations - Lenovo Support (US)
Now this process if you don't know invokes a complete clearance of everything on that drive except the partition that holds the install stuff and I would guess if the machine is not very old the SP 1 should be on that partition because it is a pain in the neck having to download and install that SP1.
Good luck and sorry I could be more helpful - let us know how you go because if the problem persists then you may have to do the tutorial method if that restore partition has been infected - anything is possible

I cannot say praktar I only know for certain that factory restores typically tell one that the machine will essentially be the same as when it came out of the box. having said that you are right the MBR may have become infected and I am wondering if that will have been sorted by doing this.

There is this but like so many others I am assuming you were not supplied with any rescue media unless you made one yourself. http://support.microsoft.com/kb/927392


The other option is I am really doing some wishful thinking here is that if you do a clean install as per that link you may be able to download the Lenovo stuff you like - it would be a first I guess but worth asking Lenovo first or Googling for it.

My own personal thoughts on it mate is that is it worth it to have that face recognition stuff because lets face it (no pun) anything can be hacked if they want to badly enough. and I think if you used all the user account security stuff it would be suffice.

PS I messaged you look for it at the top of the page.