Malware corrupted registry I have not shut down yet PLEASE HELP!

Hi. I was checking out a webpage and when I went to close the tab a window popped up saying something like (don't remember exactly) a problem was detected with registry settings being changed, don't shutdown your computer, something about blackscreen , no microsoft support call this number and there was a button to click ok which I DID NOT click. I thought this was some kind of randsomware and quickly closed the page. next I tried to do a system restore but get an error telling me windows has detected file system corruption and to check the disk for errors. I am afraid to click the link for that because I don't have much faith in windows automatically fixing the issue. I think this might have changes something in the registry and haven't shut down the computer. Can anyone help please? Thanks.

Hi. Here's an update. after a full scan with MacAfee turning up nothing, Well I was forced to reboot the computer and windows loaded up to the login screen but After entering my password, there was a pause and then a black screen with just a movable mouse cursor and that's it.
I have read that this type of malware changes settings for permissions to access the hard drive. Before the computer was shut down I did notice that there was another computer named MYSHARE showing up in my network map and also a peripheral device named Jungo OpenRG Internet Gateway device which I hadn't noticed previously.
I called Optimum my ISP, and they said that it is not there equipment. BUT when I double click the icon for this internet gateway device it takes me to the optimum sign in page. So I am assuming that it is in fact their router. No other routers or anything are showing up in my network map. Anyway, I had them remotely reset the password for the router. I also found a lot of settings in my computer management shares folder that didn't seem right. I changed some of these settings and turned off file sharing etc. and was no longer seeing the second computer on my network. I've tried F8 on Startup but can't boot into safe mode. It just continues to load windows up to the login screen. I'm wondering if this could be because I'm using a wireless keyboard.
If anyone has had a similar experience or has any advice please let me know. Thank You.

ICIT2LOL First I'd like to Thank You for taking the time to try and help. I really appreciate that. Well, I went last night to buy a cheap USB keyboard to use for troubleshooting. Got it home, went to hook it up and I discovered that the F8 KEY IS BROKEN!! ARGGG!!!
So back to the store I will go today.
To answer your questions I have backed up my documents and done both a system and full backup of the computer in it's current configuration (with the issue) before the shutdown using AOMEI backupper. I also have a full backup using the same program but it's about 4 months old. Of course I would prefer to try to fix what I have first before trying to restore from the backup. Also I'm not sure but I think I would first need to do a clean install of Win 7 then install AOMEI Backupper, then do the restore. Problem is I don't have a copy of Win 7 Ultimate 32 Bit that I'm currently running. The closest I could find locally is Win 7 Professional 32 bit and I'm not sure if that will work for the backup restore or for an install repair. At least for the install repair I think I read here that it has to be the exact same version? I actually was running Kaspersky Anti Virus on this computer previously and had some bad experiences with them but I believe I still have the rescue disk I created and will give that a go as soon as I get the new keyboard.

Okay, I got another USB Keyboard to replace the wireless and still can't access BIOS . The function keys don't respond. I've tried pressing F2 repeatedly during startup then repeated the process with F12, F8 etc. None of them work. I did notice that the Num lock light comes on. I then disconnected the hard drive and started it to see if It would go into BIOS but it didn't. This is a Dell Optiplex GX520. Any idea's???

UPDATE: I took the CMOS battery out of the motherboard for about 15 minutes and put it back in. This evidently DID reset the BIOS settings to default because this time F2 worked and I was able to go in and change the boot sequence.
I am running the Kaspersky 10 rescue disk and will see what turns up.

OK. Ran a Kaspersky Rescue disk thorough full scan that took over a full day to complete which didn't turn up anything. I was about to throw in the towel but instead tryed playing around with the boot order in the BIOS some more and this time around was finally able to use the F8 key to boot up in safe mode. I then ran a system restore from the only restore point that was available. The computer rebooted but told me that system restore didn't complete successfully and none of my system files had been changed. BUT somehow, I am now able to login to windows in normal mode and no more black screen. 2 things though. I am seeing during bootup a message that says Floppy disk read error press F1 to continue and I don't have or have activated in the BIOS a floppy. So I am a little perplexed by that. Second, If I was not able to complete a system restore successfully, I'm thinking that there must still be some files messed up and wondering if I should do a repair install??