Heavy lagging issue.

Are you running Disk Check from Windows or from Command Line of DVD/CD? Try both ways.

This makes running the maker's HD diagnostics even more important.

Find out the make of HD by looking at it, or typing what's listed in Device Manager>Disk Drives into Google to see what it is. Then burn the maker's diagnostics from the list to CD or DVD
 
Um Greg. My apologies. I don't have an extra CD to burn it. Therefore, I can't complete that sequence.
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
And I cannot complete the sfc /scannow as they would stuck at 33% and some words came out.
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
Greg, can I boot it from a external hard disk or maybe a thumbdrive?
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
You have probs with hardware and OS.

Deal with the HD first. Get a blank CD to burn HD diagnostics to run the full scan. Then run Disk Check again from Windows or DVD/CD command line.

Do you have a Win7 install DVD? Have you tried reinstalling to wiped HD to overwrite possible infected code?

Test the HD first as it may be the prob. Did memory test out ok using memtest86 for 5-6 passes?
 
Yes I passed with 5 - 6 passes and I tried using the windows memory thing on the repair thing. & I have the windows 7 DVD. So could I boot the HD diag with thumb drive? Then continue with my windows 7 repair installation?
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
You can try writing the HD diag/repair ISO to flash stick using UltraISO trial version: on File tab Open ISO, on Bootable tab Write Disk Image, Click Format first, then Write button.

Boot flash stick by setting first to boot in BIOS setup, or using one-time Boot Menu key. May be listed under HD's.
 
I tried booting from the USB but I waited for around 30minutes - 1hour but to no avail, it would get stuck with these words "Start booting from USB device..." and it will not budge even by a little bit. Help would be appreciated, thanks.
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
& I can't repair install, as I tried it just now, it shows that Windows is rolling back to the previous OS. So, should I go for a clean install?
 

My Computer

Computer Manufacturer/Model Number
Custom Built
OS
Windows 7 x64 OEM Build 7600
CPU
Intel Core i5-750 Lynnfield
Motherboard
MSI P55-GD65
Memory
Team Elite DDR3 1333 CL9 (4GB Kit) 2GB x 2 TED34096M1333(H)C
Graphics Card(s)
HIS ATI Radeon HD 5850
Sound Card
Onboard Sound Card
Monitor(s) Displays
Samsung P2250 21.5" inch
Screen Resolution
1920x1080
Hard Drives
Western Digital Caviar Black 1TB
PSU
Corsair HX650W 650W
Case
Antec Nine-Hundred Two
Cooling
Coolermaster Hyper 212 Plus RR-B10-212P-GP
Keyboard
Razer Lycosa
Mouse
Razer Deathadder 3500DPI
You reported earlier that DIsk Check would not complete. This needs to be resolved first as you may have a failing HD.

Did you run DIsk Check from the DVD Command Line as shown in the tutorial I posted? http://www.sevenforums.com/tutorials/433-disk-check.html

You'll definitely need to get a CD to burn the HD Diag/Repair CD scan, boot to run the full scan.

I have never heard of the Repair Install error you got. Please attempt to run the Repair Install again following the exact steps in tutorial, then post back (and Google) the exact wording of any error message.
 
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