Windows Live Mail can't communicate with Windows 7 file directory

Magician mate you might try these

https://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

https://www.sevenforums.com/tutorials/433-disk-check.html < use the /f and /r options in Option2 if necessary
if these do nothing then these

http://www.superantispyware.com/

http://www.malwarebytes.org/products/malwarebytes_free/

http://www.bleepingcomputer.com/download/adwcleaner/
downloadfrom bleeping computer – delete any rubbish these find.

Magician this is completely up to you but whenever I do an install or make slight changes to the registry I always back up it first is a really good safety net.
Registry - Backup and Restore

and if you ant to get a little more out of the machine this is the bible:)
Optimize Windows 7 it also has registry changes but it is very safe being written by a real genius.

Those other free scans are worth keeping too mate especially Malwarebytes and ADW - there are more and if you get into strife you only have too post in here for other stuff you can use.

I know one should never run two real time AV's at the same time so personally if it were me I would run the free SAS and just leave your McAfee to it's own devices as some of the problem's may have been due to them conflicting.
However I am not a great fan of McAfee but if you are then all's well.

Sounds very much like my sort of usage I reckon the Malwarebytes is worth keeping on board I have the paid for version running real time on my laptop and Ivy Bridge and it is about the only real time that my Kaspersky will not conflict with. The ADW mate is real good at rooting stuff out of the registry and another one I give a bit of a trot out when necessary and link others to is this Emsisoft Free Emergency Kit: Portable malware scanner | Free removal of Viruses, Bots, Spyware, Keyloggers and Trojans I only use the Emergency and Command line scan and if really stuck this one will run from power up so it does involve booting the OS is this one Download Kaspersky Rescue Disk 10 and if you are worried about rootkits then there these Best Free Rootkit Scanner and Remover the TDSS Killer is usually effective enough.

Having ranted on about this I would seriously consider another AV mate as I think I said before I am not a fan of McAfee or Norton, AVG or MSE for that matter but it is a personal choice issue. I have had Kaspersky on my five machines now and never have had any problems and it is relatively cheap - for me about $0.13 a day.

If you are looking for a free AV then this is a good link http://www.techsupportalert.com/content/probably-best-free-security-list-world.htm go to page 2 for the real time stuff but as you will see tons of stuff. This is an excellent site all over:)

A bit off topic my biking days are over after wrecking my shoulder gold prospecting and also my woodworking days are also over so being interested in electronics all my life computing fits a very nice bill.
Pic of me and the Big Girl taken in better days you can see I am a small bloke and the 365 kilos (dry) was a real handful. ('98 Yamaha Virago Special 1100cc) She was fully kitted out (radio sidebags top box bar warmers and a few electronic gadgets that for example told me re the battery condition / charge) - for long trips and so comfortable and for a heavy bike surprisingly quick. The only drawback - a small tank just 200 kilometres before it needed a drink (like I used to LOL!!)

Ah well blathered on so
Stay upright!!