To the OP
1. Windows Defrag utility cannot defrag pagefile, system file, currently executed files, MFT data and MFT file zone. It simply defrags the resident idle files. So......its worth purchasing advanced defrag utility, I'll personally recommend you to try Raxco Perfect Disc, cuz its a Microsoft Gold Certified partner: a bit rare certification which Microsoft entitles upon vigorous testing. Download the trial version and run a system file defragmentation (the button on the top of the program window).
2. Use BartPE (freeware) to create an excellent rescue disk (works like a charm )
3. You're using Avira free edition, I hope you'll be knowing it has a stripped down detection bases...as compared with the paid versions. Take a look at the AV-Comparatives test, and figure it out which AV suites you needs....you should invest some money in purchasing AV .