computer locks up when online only

sinkerball

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I apologize if this issue has been dealt with elsewhere. I see that there are detailed suggestions for dealing with windows 7 performance issues and these might resolve my problem (or not). However I have already implemented many of these (I think).

e.g.
Troubleshoot Application Conflicts by Performing a Clean Startup

I am running Windows 7 64 bit on a 1 year old Lenovo with i7-6400U, 8GB RAM, 500GB HD.

I have had this PC for almost one year and have been using 'selective startup' for almost that time w/o problems. For a couple of days however, while online the computer will freeze after about 5-10 minutes.
For a week or so before that I could not login to gmail but that seemed solved when I changed my password.

I have run my antivirus (Webroot) and anti-malware MalwareBytes (sp?) with nothing found. This has been done while online (until that became impossible) and in safe mode.

Last night I let my PC run offline for a while and it was OK although in Task Mgr. I noticed that CPU usage would sometimes spike up to about 40%. There are no processes that seem to use a great deal of CPU. However, I cannot open 'Resource Monitor.' Even though I use the selective startup there are about 100 processes running while offline.

Yesterday I restored the computer to its state of the previous morning with no effect.

I have looked for 'suspicious' processes but it seems difficult if not impossible to find conclusive information online about which are 'bad.'

Other than following the suggestions elsewhere on this site I am considering the following:
1. Restore to an earlier point if possible.
2. Change browsers
3. Make sure I have copies of all file and use the Windows 7 system recovery discs I got from Lenovo.

Any thoughts or questions are welcome.

Thanks in advance.
William
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Lenovo
OS
Windows 7 64 bit
CPU
i7 6400U
Memory
8 GB
Hard Drives
500GB
Antivirus
webroot
Browser
IE 11

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home made Desktop
OS
Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
CPU
Intel i7-6800K @ 4.3
Motherboard
ASUS X-99 Deluxe II
Memory
Corsair Platinum 16 gig @2400
Graphics Card(s)
EVGA GTX 1070 OC
Monitor(s) Displays
Asus 27" LED LCD/VE278Q
Screen Resolution
1920-1080 or 1280-720 HDMI
Hard Drives
INTEL SSD 730-240 Gb Sata 3.0/
PSU
EVGA Platium 1200W
Case
Phanteks Luxe Tempered Glass 8 fans/ one radiator
Cooling
XSPC/ Water Cooled CPU
Keyboard
Das 4 Professional
Mouse
Logitech M705/MX Anywhere 2-S
Internet Speed
100 mbits
Antivirus
Microsoft Security Essentials/ Malwarebytes Premium 3.0/ SAS
Browser
I.E. 11 default/Firefox/ ISP Time Warner Cable/Spectrum
Other Info
LG BluRay Burner/
Sound system-KLipsch-THX/
Icy Dock ssd Hot Swap bays.
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