Thanx everyone for your imput, Marc, bojan, Steve, Leon

I dont think I ave virus protection, never seems to be any obvious problems, thought it was built in with Win 7 service pack ? I do use malwarebytes now and then tho, , prob wise to install Advast, had it a long time ago before win 7.. Cheers..
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Re: sharkbite, Thnx, and no not crashing, just not alligning stars when stacking,, was doing it perfectly a few months ago with nebulosity, but now not.
DSStacker was stacking 10-12 images in about 5 minutes when I 1st intalled it bout 5 yr ago, now it takes like 10 minutes to just 1/4 register the 1st frame, so I just stop it, task manager,, and registax keeps saying it runs out of memory and doesnt agree with over 5000 or something pixels long side of frame, my 6DII has 6240 long side ?
RE: sharkbite & (Chrys)
I had the system rebuilt back in 2015, everything seem quiite fine with it, except stacking astro,
I dont run any capture or scope/mount control on it, thats done with the field lappy..
This desktop consisting of
1 Gigabyte motherboard GA-B85M-D3H LGA1150 with 2 x Kingston DDR3 8GB 1600MHz RAM
2 x SSD SATA drives 240GB each, 550 MB/s read
Intel i7 4790 3.8Ghz 8MB Quad core CPU
soo, no slouch even consideriing its over 6yr ago,, just thinking Win 7 maybe the culprit, I uninstalled DDS and could not download the latest version as kept coming up with multiple endless error reports, therefore thinking other bugs and what have you may be creeping in considering no continued support ?
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Thanx also astro744, will definatly take that onboard if upgrade, much appreaciate
Cheers all and for any further insight, recommendations