Looking for firmware update instead replacing hardware!

I have bought lenovo g500 laptop and windows 7 x64 installation cd but unfortunately I encountered problems with internet worm attack obviously because I didn't install any software except necessary drivers,internet browsers etc.My PC is acting with delay on opening programs,I even can't complete system restore.I did two reinstalls of OS but the PC works well only with install interface and all is like that untill I connect internet.So I think there is a downloader-program inserted into some hardware chip firmware.Is there any chance a skilled member on the forum can help me.

It sounds like you got hit by a root kit.  This will take some effort to fix, but there is a few things to try.  First thing to do is reset the BIOS by removing AC power and Battery, then press and hold the power key for 30 seconds.  Replace battery then AC adapter.
Once BIOS defaut process completes:
Download and run Malwarebytes Anti Rootkit  Link to download page (english)
Unpack to desktop, run program.
When the scan completes, quarentine all malware found, then let it reboot the computer.
Repeate as needed until clean blil of health.
Once completed, slect tools and run Fix Damage app.
Once this has completed, download and install  AVAST Free, register (no cost) and pull in latest updates.  Download and run CCleaner as well.  Also handy to have on hand is Malwarebytes Free, an ondemand Malware scan and removal tool - think penecillin shot.
Good luck.

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    Hi @macrionitis ,
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