Hi, I'm not sure if I should be posting this in the malware section or the Windows 7 section as I have a two-fold problem, part of which is defintely malware related, and possibly all of it.
Firstly I have a 64-bit Home Premium W7 SP1 on a Dell Inspiron One 19 which has recently (this month) had a successful repair install and had just been fully updated, then on a routine weekly Malwarebytes scan it picked up a Trojan.Zekos.Patched764SP0 infecting the rpcss.dll+ (Not rpcss.dll!). I tried to quarantine this in Normal mode but it wouldn't succeed, so booted into Safe mode, rescanned and then it seemed to successfully quarantine it. Avast and SAS had both missed this supposed infection by the way, anyway after googling I read a post on here about the same trojan and decided to run some further scans - namely RKill (clear), AdwCleaner (found some adware and PUPs but no trojans, RogueKiller (clear), HitmanPro (clear), SpyHunter (clear), and ESET online scanner (found some PUPs and other stuff but never completed so I didn't get to check the full findings!). I also uploaded both these rpcss files to Virustotal and both showed as clean!
Moving onto the second part of this story, while in the middle of the ESET and another scan (I forget which) the machine BSOD'd with a generic error about something being connected to the machine (there was nothing other than mouse and keyboard and phone which I tether to connect to the internet, same error without the phone connected). On rebooting it went into Repair mode but said it couldn't repair the machine, and it's been stuck there ever since, over 2 days now!
I've tried several of the options from the F8 menu (last known good configuration, safe mode, repair, with networking/command prompt, etc etc), all without success. I've used my W7 install disk to go into advanced repair options and tried to copy my registry hive back from config/regback to config, but only the SOFTWARE file had changed since the repair, and it made no difference. I've also tried renaming bootcache.dat file in CodeIntegrity and rebooting, and copying in a file from a good W7 machine, but neither had any effect. At the moment it's stuck in this repair mode loop and has had about 30 attempts, but every time says it couldn't fix the errors. On the Send/Don't send screen in Startup Repair, it says Problem Signature 05 ExternalMedia ; Problem Signature 07 Corrupt Registry, yet no external media is connected and the registry was fine after the install and SFC was coming up clear. chkdsk has showed an index error which it couldn't correct and got stuck on, but that was on my E: drive, where all my personal data is, but the OS drive C: was showing fine (same HDD but I've partitioned it off to separate OS and data).
So I'm now at a bit of a loss, haven't found anything online (yet) to cure this or get it to boot into windows (I feel like booting it Through a freaking window to be honest! , other than suggestions to do a clean install - which may well be the only solution ultimately, but I'm still worried about the trojan (which only MBAM picked up!), and any potential issues it might have caused to the system, which may or may not be fixed by doing a repair or fresh install, so if you've any advice as to where to go from here I'd very much appreciate it